In 1415 a
Burgrave came from the south to the
March of Brandenburg and took control of the area as elector.
 In 1417 the Hohenzollern was made an elector of the
Holy Roman Empire.
Polish wars, the newly established
Baltic towns of the
German states, including
Prussia, suffered many economic setbacks.
 Many of the Prussian towns could not even afford to attend political meetings outside of Prussia. The towns were poverty stricken, with even the largest town,
Danzig, having to borrow money from elsewhere to pay for trade.
 Poverty in these towns was partly caused by Prussia's neighbours, who had established and developed such a monopoly on trading that these new towns simply could not compete. These issues led to feuds, wars, trade competition and invasions.
 However, the fall of these towns gave rise to the nobility, separated the east and the west, and allowed the urban middle class of
Brandenburg to prosper.
It was clear in 1440 how different Brandenburg was from the other German territories, as it faced two dangers that the other German territories did not, partition from within and the threat of invasion by its neighbours.
 It prevented partition by enacting the
Dispositio Achillea, which instilled the principle of primogeniture to both the Brandenburg and Franconian territories.
 The second issue was resolved through expansion. Brandenburg was surrounded on every side by neighbours whose boundaries were merely political.
 Any neighbour could attack and consume Brandenburg at any moment. The only way to defend herself was to absorb her neighbours before they absorbed her.
 Through negotiations and marriages Brandenburg slowly but surely expanded her borders, absorbing neighbours and eliminating the threat of attack.
Hohenzollerns were made rulers of the
Margraviate of Brandenburg in 1518. In 1529 the Hohenzollerns
secured the reversion of the
Duchy of Pomerania after
a series of conflicts, and
its eastern part following the
Peace of Westphalia.
In 1618 the Hohenzollerns inherited the
Duchy of Prussia, since 1511 ruled by Hohenzollern
Albrecht of Brandenburg Prussia, who in 1525 converted the
Teutonic Order ruled state to a
Protestant Duchy by accepting
fiefdom of the crown of Poland. It was ruled in a
personal union with Brandenburg, known as "
Brandenburg-Prussia". In the course of the
Second Northern War, the treaties of
Wehlau-Bromberg granted the Hohenzollerns full sovereignty over the Prussian duchy by September 1657.
In return for an alliance against France in the
War of the Spanish Succession, the Great Elector's son, Frederick III, was allowed to elevate Prussia to a kingdom in 1701. Frederick crowned himself "
King in Prussia" as
Frederick I on 18 January. Legally, no kingdoms could exist in the Holy Roman Empire except for
Bohemia. However, Frederick took the line that since Prussia had never been part of the empire and the Hohenzollerns were fully sovereign over it, he could elevate Prussia to a kingdom.
The style "King in Prussia" was adopted to acknowledge the
legal fiction that the Hohenzollerns were legally kings only in their former duchy. In Brandenburg and the portions of their domains that were within the Empire, they were still legally only electors under the overlordship of the emperor. However, by this time the emperor's authority was only nominal. The rulers of the empire's various territories acted largely as the rulers of
sovereign states, and only acknowledged the emperor's suzerainty in a formal way. In addition, the Duchy was only the eastern half of the region of Prussia; the
western half was held by the King of Poland. While the personal union between Brandenburg and Prussia legally continued until the end of the empire in 1806, from 1701 onward Brandenburg was de facto treated as an integral part of the kingdom. Since the Hohenzollerns were nominally still subjects of the emperor within the parts of their domains that were part of the empire, they continued to use the additional title of Elector of Brandenburg until the empire was dissolved. It was not until 1772 that the title was changed to "King of Prussia".
1700–1721: Aftermath of the Thirty-Years' War and the Great Northern War
The Kingdom of Prussia was devastated from the
Thirty Years' War and poor in natural resources. Its territory was disjointed, stretching 1,200 km (750 mi) from the lands of the Duchy of Prussia on the south-east coast of the
Baltic Sea to the Hohenzollern heartland of
Brandenburg, with the exclaves of
Ravensberg in the
Rhineland. In 1708 about one third of the population of the Duchy of Prussia
 The plague reached
Prenzlau in August 1710 but receded before it could reach the capital
Berlin, which was only 80 km (50 mi) away.
Great Northern War was the first major conflict that the Kingdom of Prussia was involved in. Starting in 1700, the Great Northern War involved a coalition led by Tsarist Russia against the dominant North European power at the time, the
Frederick William in 1705 tried to get
Prussia involved in the war, stating it "best Prussia has her own army and make her own decisions."
 His views, however, were not considered acceptable by those in power. It was not until 1713 that Frederick William gained full royal powers.
 Therefore, in 1715, Prussia, led by Frederick William, joined the coalition for various reasons,
 including the danger of being attacked from both her rear and the sea; her claims on
Pomerania; and the fact that if she stood aside and Sweden lost she would not get a share of the territory.
 Prussia only participated in one battle, the
Battle of Stresow on the island of
Rügen, as the war had already been practically decided in the 1709
Battle of Poltava. In the
Treaty of Stockholm Prussia gained all of Swedish Pomerania east of the river
Oder. Sweden would however keep
Vorpommern until 1815. The Great Northern War not only marked the end of the Swedish Empire but also elevated Prussia and Russia as new powers in Europe.
The Great Elector incorporated the
Junkers, the landed aristocracy, into the empire's bureaucracy and military machine, giving them a vested interest in the
Prussian Army and
King Frederick William I inaugurated the Prussian compulsory system in 1717.
1740–1762: Silesian Wars
Prussian territorial acquisitions in the 18th century
In 1740 King
Frederick II (Frederick the Great) came to the throne. Using the pretext of a 1537 treaty (vetoed by Emperor
Ferdinand I) by which parts of
Silesia were to pass to
Brandenburg after the extinction of its ruling
Piast dynasty, Frederick invaded Silesia, thereby beginning the
War of the Austrian Succession. After rapidly occupying Silesia, Frederick offered to protect Archduchess
Maria Theresa of Austria if the province were turned over to him. The offer was rejected, but Austria faced several other opponents, and Frederick was eventually able to gain formal cession with the
Treaty of Berlin in 1742.
To the surprise of many, Austria managed to renew the war successfully. In 1744 Frederick invaded again to forestall reprisals and to claim, this time, the
province of Bohemia. He failed, but
French pressure on Austria's ally
Great Britain led to a series of treaties and compromises, culminating in the 1748
Treaty of Aix-la-Chapelle that restored peace and left Prussia in possession of most of Silesia.
Humiliated by the cession of Silesia, Austria worked to secure an alliance with France and Russia (the "
Diplomatic Revolution"), while Prussia drifted into Great Britain's camp forming the
Anglo-Prussian Alliance. When Frederick preemptively invaded Saxony and Bohemia over the course of a few months in 1756–1757, he began a
Third Silesian War and initiated the
Seven Years' War.
This war was a desperate struggle for the Prussian Army, and the fact that it managed to fight much of Europe to a draw bears witness to Frederick's military skills. Facing Austria, Russia, France, and Sweden simultaneously, and with only Hanover (and the non-continental British) as notable allies, Frederick managed to prevent serious invasion until October 1760, when the Russian army briefly occupied
Königsberg. The situation became progressively grimmer, however, until the death in 1762 of Empress
Elizabeth of Russia (
Miracle of the House of Brandenburg). The accession of the Prussophile
Peter III relieved the pressure on the eastern front. Sweden also exited the war at about the same time.
Defeating the Austrian army at the
Battle of Burkersdorf and relying on continuing British success against France in the war's colonial theatres, Prussia was finally able to force a
status quo ante bellum on the continent. This result confirmed Prussia's major role within the German states and established the country as a European
great power. Frederick, appalled by the near-defeat of Prussia, lived out his days as a much more peaceable ruler.
1772, 1793, and 1795: Partitions of Polish–Lithuanian Commonwealth
To the east and south of Prussia, the
Polish–Lithuanian Commonwealth had gradually weakened during the 18th century. Alarmed by increasing Russian influences in Polish affairs and by a possible expansion of the
Russian Empire, Frederick was instrumental in initiating the first of the
Partitions of Poland between Russia, Prussia, and Austria in 1772 to maintain a
balance of power. The Kingdom of Prussia annexed most of the Polish province of
Royal Prussia, including
Warmia; the annexed land was organised the following year into the
Province of West Prussia. The new territory connected the
Province of East Prussia (the territory previously known as the
Duchy of Prussia) with the
Province of Pomerania, uniting the kingdom's eastern territories.
After Frederick died in 1786, his nephew
Fredrick William II continued the partitions, gaining a large part of western Poland in 1793.
In 1795 the Kingdom of Poland ceased to exist and a large area (including
Warsaw) to the south of East Prussia became part of Prussia. These new territories were organised into the Provinces of
South Prussia, and
New East Prussia.
Prussia invaded Holland to restore the
stadtholderate against the increasingly rebellious
Patriots, who sought to overthrow
House of Orange-Nassau and establish a
democratic republic. The direct cause of the invasion was the Arrest at
Goejanverwellesluis, where Frederick William II's sister
Wilhelmina of Prussia, also stadtholder
William V of Orange's wife, was stopped by a band of Patriots who denied her passage to
The Hague to reclaim her husband's position.
1801–1815: Napoleonic Wars
Treaty of Basel (1795) ended the
War of the First Coalition against France. In it, the
First French Republic and Prussia had stipulated that the latter would ensure the
Holy Roman Empire's neutrality in all the latter's territories north of the demarcation line of the river
Main, including the British continental dominions of the
Electorate of Hanover and the
Duchies of Bremen-Verden. To this end, Hanover (including Bremen-Verden) also had to provide troops for the so-called demarcation army maintaining this state of armed neutrality.
In the course of the
War of the Second Coalition against France (1799–1802)
Napoleon Bonaparte urged Prussia to occupy the continental British dominions. In 1801 24,000 Prussian soldiers invaded, surprising Hanover, which surrendered without a fight. In April 1801 the Prussian troops arrived in Bremen-Verden's capital
Stade and stayed there until October of the same year. The
United Kingdom of Great Britain and Ireland first ignored Prussia's hostility, but when it joined the pro-French coalition of armed "neutral" powers such as
Denmark–Norway and Russia, Britain started to capture Prussian sea vessels. After the
battle of Copenhagen the coalition fell apart and Prussia again withdrew its troops.
At Napoleon's instigation, Prussia recaptured British Hanover and Bremen-Verden in early 1806. On August 6 of the same year, the Holy Roman Empire was dissolved as a result of Napoleon's victories over
Austria. The title of Kurfürst (
Brandenburg became meaningless, and was dropped. Nonetheless,
Frederick William III was now de jure as well as de facto sovereign of all of the Hohenzollern domains.
 Before this time, the Hohenzollern sovereign had held many titles and crowns, from Supreme Governor of the
Protestant Churches (summus episcopus) to King, Elector, Grand Duke, Duke for the various regions and realms under his rule. After 1806 he was simply King of Prussia and summus episcopus.
But when Prussia, after it turned against the French Empire, was defeated in the
Battle of Jena–Auerstedt (October 14, 1806), Frederick William III was forced to temporarily flee to remote
 After the
Treaties of Tilsit in 1807, Prussia lost about half of its territory, including the land gained from the Second and Third
Partitions of Poland (which now fell to the
Duchy of Warsaw) and all land west of the
Elbe River. France recaptured Prussian-occupied Hanover, including Bremen-Verden. The remainder of the kingdom was occupied by French troops (at Prussia's expense) and the king was obliged to make an alliance with France and join the
Prussian reforms were a reaction to the Prussian defeat in 1806 and the Treaties of Tilsit. It describes a series of constitutional, administrative, social and economic reforms of the kingdom of Prussia. They are sometimes known as the Stein-Hardenberg Reforms after
Karl Freiherr vom Stein and
Karl August Fürst von Hardenberg, their main instigators.
defeat of Napoleon in Russia in 1812, Prussia quit the alliance and took part in the
Sixth Coalition during the "Wars of Liberation" (Befreiungskriege) against the French occupation. Prussian troops under Marshal
Gebhard Leberecht von Blücher contributed crucially in the
Battle of Waterloo of 1815 to the final victory over Napoleon.
1815: After Napoleon
Expansion of Prussia 1807–1871
Prussia’s reward for its part in France's defeat came at the
Congress of Vienna. It regained most of its pre-1806 territory. Notable exceptions included much of the territory annexed in the Second and Third Partitions of Poland, which became
Congress Poland under Russian rule. It also didn't regain several of its former towns in the south. However, as compensation it picked up some new territory, including 40% of the
Kingdom of Saxony and much of
Westphalia and the Rhineland. Prussia now stretched uninterrupted from the Niemen in the east to the Elbe in the west, and possessed a chain of disconnected territories west of the Elbe.
With these gains in territory, the kingdom was reorganised into 10 provinces. Most of the kingdom, aside from the Provinces of
West Prussia, and
Posen, became part of the new
German Confederation, a
confederacy of 39 sovereign states replacing the defunct
Holy Roman Empire.
Frederick William III submitted Prussia to a number of administrative reforms, among others reorganising the government by way of ministries, which remained formative for the following hundred years.
As to religion, reformed
Calvinist Frederick William III—as Supreme Governor of the
Protestant Churches—asserted his long-cherished project (started in 1798) to unite the
Lutheran and the
Reformed Church in 1817, (see
Prussian Union). The Calvinist minority, strongly supported by its co-religionist Frederick William III, and the partially reluctant Lutheran majority formed the
Evangelical Church in Prussia. However, ensuing quarrels causing a permanent
schism among the Lutherans into united and
Old Lutherans by 1830.
As a consequence of the
Revolutions of 1848, the Principalities of
Hohenzollern-Hechingen (ruled by a
Catholic cadet branch of the House of Hohenzollern) were annexed by Prussia in 1850, later united as
Province of Hohenzollern.
1848–1871: German wars of unification
For the half-century that followed the Congress of Vienna, there was a conflict of ideals within the
German Confederation between the formation of a single German nation and the conservation of the current collection of smaller German states and kingdoms. The creation of the German Customs Union (
Zollverein) in 1834, which excluded the
Austrian Empire, increased Prussian influence over the member states. As a consequence of the
Revolutions of 1848, King
Frederick William IV was offered the crown of a united Germany by the
Frankfurt Parliament. Frederick William refused the offer on the grounds that revolutionary assemblies could not grant royal titles. But there were two other reasons why he refused: to do so would have done little to end the internal power struggle between Austria and Prussia, and all Prussian kings (up to and including
William I) feared that the formation of a
German Empire would mean the end of Prussia's independence within the German states.
In 1848 actions taken by Denmark towards the Duchies of
Holstein led to the
First War of Schleswig (1848–51) between Denmark and the
German Confederation. Denmark won.
Frederick William issued
Prussia's first constitution by his own authority in 1848. This document—moderate by the standards of the time but conservative by today's standards—provided for a two-house parliament. The lower house, or
Landtag was elected by all taxpayers, who were divided into
three classes whose votes were weighted according to the amount of taxes paid. Women and those who paid no taxes had no vote. This allowed just over one-third of the voters to choose 85% of the legislature, all but assuring dominance by the more well-to-do men of the population. The upper house, which was later renamed the
Herrenhaus ("House of Lords"), was appointed by the king. He retained full executive authority and ministers were responsible only to him (indeed, as late as 1910, Prussian kings believed that they ruled by
divine right). As a result, the grip of the landowning classes, the
Junkers, remained unbroken, especially in the eastern provinces.
Frederick William suffered a stroke in 1857, and his younger brother, Prince William, became
regent. William pursued a considerably more moderate policy. Upon Frederick William IV's death in 1861, he succeeded to the throne as
William I. However, shortly after gaining the throne, he faced a dispute with his parliament over the size of the army. The parliament, dominated by the liberals, balked at William's desire to increase the number of regiments and withheld approval of the budget to pay for its cost. A deadlock ensued, and William seriously considered abdicating in favour of his son, Crown Prince Frederick William. He was, however, persuaded to appoint as prime minister
Otto von Bismarck, his ambassador to France. Bismarck took office on September 23, 1862.
Although Bismarck had a reputation as an unyielding conservative, he was initially inclined to seek a compromise over the budget issue. However, William refused to consider it; he viewed defence issues as the crown's personal province. Forced into a policy of confrontation, Bismarck came up with a novel theory. Under the constitution, the king and the parliament were responsible for agreeing on the budget. Bismarck argued that since they had failed to come to an agreement, there was a "hole" in the constitution, and the government had to continue to collect taxes and disburse funds in accordance with the old budget in order to keep functioning. The government thus operated without a new budget from 1862 to 1866, allowing Bismarck to implement William's military reforms.
The liberals violently denounced Bismarck for what they saw as his disregard for the fundamental law of the kingdom. However, Bismarck's real plan was an accommodation with liberalism. Although he had opposed German unification earlier in his career, he had now come to believe that it was inevitable. To his mind, the conservative forces had to take the lead in the drive toward creating a unified nation in order to keep from being eclipsed. He also believed that the middle-class liberals wanted a unified Germany more than they wanted to break the grip of the traditional forces over society. He thus embarked on a drive to create a united Germany under Prussian leadership, and guided Prussia through three wars which ultimately achieved this goal.
The first of these wars was the
Second War of Schleswig (1864), which Prussia initiated and succeeded in gaining the assistance of Austria. Denmark was soundly defeated and surrendered both Schleswig and Holstein, to Prussia and Austria respectively.
The divided administration of Schleswig and Holstein then became the trigger for the
Austro-Prussian War (1866—also known as the Seven Weeks' War), where Prussia, allied with the
Kingdom of Italy and various northern German states, declared war on the Austrian Empire. The Austrian-led coalition was crushed, and Prussia annexed four of its smaller allies—the
Kingdom of Hanover, the
Electorate of Hesse, the
Duchy of Nassau and the
Free City of Frankfurt. Prussia also annexed Schleswig and Holstein, and also effectively annexed
Saxe-Lauenburg by forcing it into a
personal union with Prussia (which was turned into a full union in 1876). King William initially wanted to take territory from Austria itself, but Bismarck persuaded him to abandon the idea. While Bismarck wanted Austria to play no future role in German affairs, he foresaw that Austria could be a valuable future ally.
With these gains in territory, the Prussian possessions in the Rhineland and Westphalia were connected to the rest of the kingdom for the first time. Counting the de facto annexation of Saxe-Lauenburg, Prussia now stretched uninterrupted across the northern two-thirds of Germany. It would remain at this size until the overthrow of the monarchy in 1918.
Bismarck used this opportunity to end the budget dispute with parliament. He proposed a bill of indemnity granting him retroactive approval for governing without a legal budget. He guessed, correctly as it turned out, that this would lead to a split between his liberal adversaries. While some of them argued that there could be no compromise with the principle of constitutional government, most of the liberals decided to support the bill in hopes of winning more freedom in the future.
The German Confederation was dissolved as part of the war. In its place, Prussia cajoled the 21 states north of the
Main into forming the
North German Confederation in 1867. Prussia was the dominant state in this new grouping, with four-fifths of its territory and population—more than the other members of the confederation combined. Its near-total control was cemented in a constitution written by Bismarck. Executive power was vested in a president—a hereditary office of the rulers of Prussia. He was assisted by a chancellor responsible only to him. There was also a two-house parliament. The lower house, or
Reichstag (Diet), was elected by universal male suffrage. The upper house, or Bundesrat (Federal Council) was appointed by the state governments. The Bundesrat was, in practice, the stronger chamber. Prussia had 17 of 43 votes and could easily control proceedings through alliances with the other states. For all intents and purposes, the new grouping was dominated by Bismarck. He served as his own foreign minister for virtually his entire tenure as prime minister of Prussia, and in that capacity was able to instruct the Prussian delegates to the Bundesrat.
The southern German states (except Austria) were forced to accept military alliances with Prussia, and Prussia began steps to merge them with the North German Confederation. Bismarck's planned
Kleindeutschland unification of Germany had come considerably closer to realisation.
The final act was the
Franco-Prussian War (1870), where Bismarck maneuvered Emperor
Napoleon III of
France into declaring war on Prussia. Activating the German alliances put in place after the Austro-Prussian War, the German states came together and swiftly defeated France, even managing to take Napoleon prisoner. Even before then, Bismarck was able to complete the work of unifying Germany under Prussian leadership. The patriotic fervour aroused by the war with France overwhelmed the remaining opponents of a unified nation, and on 18 January 1871 (the 170th anniversary of the coronation of the first Prussian king, Frederick I), the
German Empire was proclaimed in the
Hall of Mirrors at
Versailles outside of
Paris, while the French capital was still under
siege. King William became the first emperor of a unified Germany.
1871–1918: Peak and fall
Prussia in the German Empire 1871–1918
Administrative divisions of the German Empire on 1 January 1900
Bismarck's new empire was the most powerful state on the Continent. Prussia's dominance over the new empire was almost as absolute as it was with the North German Confederation. It included two-thirds of the empire's territory and three-fifths of its population. The imperial crown was a hereditary office of the House of Hohenzollern. Prussia also a large plurality of seats in the Bundesrat, with 17 votes out of 58 (17 out of 61 after 1911); no other state had more than six votes. As before, it could effectively control the proceedings with the support of its allies in the secondary states. As mentioned above, Bismarck served as foreign minister of Prussia for almost his entire career, and in that role instructed the Prussian deputies to the Bundesrat. The Imperial Army was essentially an enlarged Prussian army, and the embassies of the new empire were mostly old Prussian embassies. The constitution of the German Empire was essentially an amended version of the constitution of the North German Confederation.
However, the seeds for future problems lay in a gross disparity between the imperial and Prussian systems. The empire granted the vote to all men over 25. However, Prussia retained its restrictive three-class voting system, in which the well-to-do had 17½ times the voting power of the rest of the population. Since the imperial chancellor was, except for two periods (January–November 1873 and 1892–94) also prime minister of Prussia, this meant that for most of the empire's existence, the king/emperor and prime minister/chancellor had to seek majorities from legislatures elected by two completely different franchises.
At the time of the empire's creation, both Prussia and Germany were roughly two-thirds rural. Within 20 years, the situation was reversed; the cities and towns accounted for two-thirds of the population. However, in both the kingdom and the empire, the constituencies were never redrawn to reflect the growing population and influence of the cities and towns. This meant that rural areas were grossly overrepresented from the 1890s onward.
Bismarck realised that the rest of Europe was skeptical of his powerful new Reich, and turned his attention to preserving peace with such acts as the
Congress of Berlin. The new German Empire improved its already-strong relations with Britain. The ties between London and Berlin had already been sealed with a golden braid in 1858, when Crown Prince Frederick William of Prussia married
Princess Victoria of Britain.
William I died in 1888, and the Crown Prince succeeded to the throne as
Frederick III. The new emperor, a decided Anglophile, planned to transform Prussia and the empire into a more liberal and democratic monarchy based on the British model. However, Frederick was already ill with inoperable throat cancer, and died after only 99 days on the throne. He was succeeded by his 29-year-old son,
William II. As a boy, William had rebelled against his parents' efforts to mould him as a liberal, and had become thoroughly Prussianized under Bismarck's tutelage.
The new Kaiser Wiliam rapidly soured relations with the
Russian royal families (despite being closely related to them), becoming their rival and ultimately their enemy. Before and during
World War I (1914-1918), Prussia supplied significant numbers of soldiers and sailors in the German military, and Prussian
Junkers dominated the higher ranks. In addition, portions of the
Eastern Front were fought on Prussian soil. Prussia – along with Germany as a whole – experienced increasing troubles with revolutionaries during the war. The Great War ended by
armistice on 11 November 1918.
Uprisings in Berlin and other centres began the civil conflict of the
German Revolution of 1918–19 (German: Novemberrevolution). By late 1918, the Prussian House of Representatives was controlled by the
Social Democratic Party of Germany (SPD), which advocated
Marxism. William knew that he had lost his imperial crown for good, but still hoped to retain his Prussian crown. However, this was impossible under the imperial constitution, which stipulated that the imperial crown was tied to the Prussian crown. In any event, he had lost support of the military who might have fought for him. William's abdication as both king of Prussia and German emperor was announced on 9 November 1918, and he went into exile in the
Netherlands the next day. With armed revolts, mass strikes, and street fighting in Berlin, the Prussian state government declared a state of siege and appealed for imperial military aid. The Garde-Kavallerie-Schützen-Division, commanded by
Waldemar Pabst, moved against the strikers in Berlin. By the end of the fighting on 16 March, they had killed approximately 1,200 people, many of them unarmed and uninvolved. The revolutionary period lasted from November 1918 until the establishment in August 1919 of a republic that later became known as the
Prussia was incorporated as a state in the Weimar Republic. Under the republic, undemocratic public institutions were abolished, including the disappearance "of the Prussian Upper House, [and] the former Prussian Lower House that had been elected in accordance with the three-class suffrage".