Changes shaping the nature of the Holy Roman Empire took place during conferences in
Rastatt (1797–1799) and
Regensburg (1801–1803). On 24 March 1803, the
Imperial Recess (
German: Reichsdeputationshauptschluss) was declared, which reduced the number of
ecclesiastical states from 81 to only 3 and the
free imperial cities from 51 to 6. This measure was aimed at replacing the old constitution of the Holy Roman Empire, but the actual consequence of the Imperial Recess was the end of the empire. Taking this significant change into consideration, the German Emperor Francis II created the title Emperor of Austria, for himself and his successors.
In 1804, the
Holy Roman Emperor Francis II, who was also ruler of the lands of the
Habsburg Monarchy, founded the Empire of Austria, in which all his lands were included. In doing so he created a formal overarching structure for the Habsburg Monarchy, which had functioned as a
composite monarchy for about three hundred years. He did so because he foresaw either the end of the Holy Roman Empire, or the eventual accession as Holy Roman Emperor of
Napoleon, who had earlier that year adopted the title of an Emperor of the French; Francis II eventually abandoned the title of German-Roman Emperor later in 1806. To safeguard his dynasty's imperial status he adopted the additional hereditary title of
Emperor of Austria. Apart from now being included in a new "
Kaiserthum", the workings of the overarching structure and the status of its component lands at first stayed much the same as they had been under the composite monarchy that existed before 1804.
This was especially demonstrated by the status of the
Kingdom of Hungary, a country that had never been a part of the Holy Roman Empire and which had always been considered a separate realm—a status that was affirmed by Article X, which was added to Hungary's constitution in 1790 during the phase of the composite monarchy and described the state as a Regnum Independens. Hungary's affairs remained administered by its own institutions (King and Diet) as they had been beforehand. Thus no Imperial institutions were involved in its government.
The fall and dissolution of the Holy Roman Empire was accelerated by French intervention in the Empire in September 1805. On 20 October 1805, an Austrian army led by General
Karl Mack von Leiberich was
defeated by French armies near the town of Ulm. The French victory resulted in the capture of 20,000 Austrian soldiers and many cannons. Napoleon's army won another victory at
Austerlitz on 2 December 1805. Francis was forced into negotiations with the French from 4 to 6 December 1805, which concluded with an armistice on 6 December 1805.
The French victories encouraged rulers of certain imperial territories to ally themselves with the French and assert their formal independence from the Empire. On 10 December 1805,
Maximilian IV Joseph, the
Duke of Bavaria, proclaimed himself King, followed by the Duke of Württemberg
Frederick III on 11 December.
Margrave of Baden, was given the title of
Grand Duke on 12 December. Each of these new states became French allies. The Treaty of Pressburg between France and Austria, signed in Pressburg (today
Slovakia) on 26 December, enlarged the territory of Napoleon's German allies at the expense of defeated Austria.
Francis II agreed to the humiliating
Treaty of Pressburg (26 December 1805), which in practice meant the dissolution of the long-lived
Holy Roman Empire and a reorganization under a Napoleonic imprint of the German territories lost in the process into a precursor state of what became
modern Germany, those possessions nominally having been part of the Holy Roman Empire within the present boundaries of Germany, as well as other measures weakening Austria and the Habsburgs in other ways. Certain Austrian holdings in Germany were passed to French allies—the
King of Bavaria, the
King of Württemberg and the
Elector of Baden. Austrian claims on those German states were renounced without exception.
On 12 July 1806, the
Confederation of the Rhine was established, comprising 16 sovereigns and countries. This confederation, under French influence, put an end to the Holy Roman Empire. On 6 August 1806, even Francis recognized the new state of things and proclaimed the dissolution of the Holy Roman Empire, as he did not want Napoleon to succeed him. This action was unrecognized by
George III of the United Kingdom who was also the
Elector of Hanover and had also lost his German territories around
Hanover to Napoleon. His claims were later settled by the creation of the
Kingdom of Hanover which was held by George's British heirs until
Queen Victoria's accession, when it split into the British and Hanoverian royal families.
Klemens von Metternich became Foreign Minister in 1809. He also held the post of Chancellor of State from 1821 until 1848, under both
Francis II and his son
Ferdinand I. The period of 1815-1848 is also referred to as the "
Age of Metternich".
 During this period, Metternich controlled the
Habsburg Monarchy's foreign policy. He also had a major influence in European politics. He was known for his strong conservative views and approach in politics. Metternich's policies were strongly against revolution and liberalism.
 In his opinion, liberalism was a form of legalized revolution.
 Metternich believed that absolute monarchy was the only proper system of government.
 This notion influenced his anti-revolutionary policy to ensure the continuation of the Habsburg monarchy in Europe. Metternich was a practitioner of balance-of-power diplomacy.
 His foreign policy aimed to maintain international political equilibrium to preserve the Habsburgs' power and influence in international affairs. Following the
Napoleonic Wars, Metternich was the chief architect of the
Congress of Vienna in 1815.
 The Austrian Empire was the main beneficiary from the Congress of Vienna and it established an alliance with
Russia forming the
 The Austrian Empire also gained new territories from the Congress of Vienna, and its influence expanded to the north through the
German Confederation and also into
 Due to the Congress of Vienna in 1815, Austria was the leading member of the German Confederation.
 Following the Congress, the major European powers agreed to meet and discuss resolutions in the event of future disputes or revolutions. Because of Metternich's main role in the architecture of the Congress, these meetings are also referred to as the "Metternich congress" or "Metternich system". While Metternich was the Austrian foreign minister, other congresses would meet to resolve European foreign affairs. These included the Congresses of Aix-la-Chapelle (1818), Carlsbad (1819), Troppau (1820), Laibach (1821), and Verona (1822).
 The Metternich congresses aimed to maintain the political equilibrium among the European powers and prevent revolutionary efforts. These meetings also aimed to resolve foreign issues and disputes without resorting to violence. By means of these meetings and by allying the Austrian Empire with other European powers whose monarchs had a similar interest in preserving conservative political direction, Metternich was able to establish the Austrian Empire's influence on European politics. Also, because Metternich used the fear of revolutions among European powers, which he also shared, he was able to establish security and predominance of the Habsburgs in Europe.
nationalist revolts in Austrian north Italy and the German states were forcibly crushed. At home, he pursued a similar policy to suppress revolutionary and liberal ideals. He employed the Carlsbad Decrees of 1819, which used strict
censorship of education, press and speech to repress revolutionary and liberal concepts.
 Metternich also used a wide-ranging spy network to dampen down unrest.
Metternich operated very freely with regard to foreign policy under Emperor Francis II's reign. Francis died in 1835. This date marks the decline of Metternich's influence in the Austrian Empire. Francis' heir was his son Ferdinand I, but he suffered from an intellectual disability.
 Ferdinand's accession preserved the Habsburg dynastic succession, but he was not capable of ruling.
 The leadership of the Austrian Empire was transferred to a state council composed of Metternich, Francis II's brother Archduke Louis, and
Count Franz Anton Kolowrat, who later became the
first Minister-President of the Austrian Empire. The liberal
Revolutions of 1848 in the Austrian Empire forced Metternich's resignation. Metternich is remembered for his success in maintaining the status quo and the Habsburg influence in international affairs.
 No Habsburg foreign minister following Metternich held a similar position within the empire for such a long time nor held such a vast influence on European foreign affairs.
Historians often remember the Metternich era as a period of stagnation: the Austrian Empire fought no wars nor did it undergo any radical internal reforms.
 However, it was also thought of as period of economic growth and prosperity in the Austrian Empire.
 The population of Austria rose to 37.5 million by 1843. Urban expansion also occurred and the population of Vienna reached 400,000. During the Metternich era, the Austrian Empire also maintained a stable economy and reached an almost balanced budget, despite having a major deficit following the Napoleonic Wars.
Revolutions of 1848
From March 1848 through November 1849, the Empire was threatened by revolutionary movements, most of which were of a nationalist character. Besides that, liberal and even socialist currents resisted the empire's longstanding conservatism. Ultimately, the revolutions failed, in part because the various revolutionaries had conflicting goals.
The Bach years
After the death of
Prince Felix of Schwarzenberg in 1852, the Minister of the Interior
Baron Alexander von Bach largely dictated policy in Austria and Hungary. Bach centralized administrative authority for the Austrian Empire, but he also endorsed
reactionary policies that reduced
freedom of the press and abandoned public trials. He later represented the
Absolutist (or Klerikalabsolutist) direction, which culminated in the concordat of August 1855 that gave the
Roman Catholic Church control over education and family life. This period in the history of the Austrian Empire would become known as the era of neo-absolutism, or Bach's absolutism.
The pillars of the so-called Bach system (Bachsches System) were, in the words of
Adolf Fischhof, four "armies": a standing army of soldiers, a sitting army of office holders, a kneeling army of priests and a fawning army of sneaks. Prisons were full of political prisoners: for example during his administration,
Czech nationalist journalist and writer
Karel Havlíček Borovský was forcibly expatriated (1851–1855) to
Brixen. This exile undermined Borovský's health and he died soon afterwards. This affair earned Bach a very bad reputation amongst Czechs and subsequently led to the strengthening of the
Czech national movement.
However his relaxed ideological views (apart from the neo-absolutism) led to a great rise in the 1850s of
economic freedom. Under him the internal
customs duties were abolished, and peasants were emancipated from their feudal obligations.
In her capacity as leader of the German Confederation, Austria participated with volunteers in the
First War of Schleswig (1848 to 1850).
Sardinia allied itself with
France for the conquest of
Lombardy–Venetia. Austria was defeated in the 1859 armed conflict. The Treaties of
Zürich removed Lombardy, except for the part east of the Mincio river, the so-called
Constitution of 1861 created a House of Lords (Herrenhaus) and a House of Deputies (Abgeordnetenhaus). But most nationalities of the monarchy remained dissatisfied.
After the second war with Denmark in 1864, Holstein came under Austrian, Schleswig and Lauenburg under Prussian administration. But the internal difficulties continued.
 Diets replaced the parliament in 17 provinces, the
Hungarians pressed for autonomy, and Venetia was attracted by the now unified Italy.
After Austria was defeated in the Austro-Prussian War of 1866 and the German Confederation was dissolved, the Austro-Hungarian Compromise of 1867 was adopted. By this act, the Kingdom of Hungary and the Empire of Austria as two separate entities joined together on an equal basis to form the Dual Monarchy of Austria-Hungary.
The frequent abbreviation
K.u.K. (Kaiserliche und Königliche, "Imperial and Royal") does not refer to that dual monarchy but originated in 1745, when the "royal" part referred to the Apostolic Kingdom of Hungary.