He returned to his homeland upon the invitation of his brother Andrew, who had in the meantime been crowned King of Hungary. Andrew assigned the administration of the so-called ducatus or "duchy", which encompassed around one-third of the territory of the Kingdom of Hungary, to Béla. The two brothers' relationship became tense when Andrew had his own son, Solomon, crowned king, and forced Béla to publicly confirm Solomon's right to the throne in 1057 or 1058. Béla, assisted by his Polish relatives, rebelled against his brother and dethroned him in 1060. He introduced monetary reform and subdued the last uprising aimed at the restoration of paganism in Hungary. Béla was fatally injured when his throne collapsed while he was sitting on it.
Béla was born between 1015 and 1020. It is debated whether Béla was a second or a third son. The former view is represented, for example, by the Polish historian Wincenty Swoboda, and the latter by the Hungarian scholars Gyula Kristó and Ferenc Makk. Kristó and Makk write that Béla's name "most probably" derived from the Turkish adjective bujla ("noble"). However, the name may also be connected to the Slavic word for white (bjelij) or to the Biblical name Bela.
In exile (1031 – c. 1048)
King Stephen's only son who survived infancy, Emeric, died on 2 September 1031. Thereafter, Vazul had the strongest claim to succeed the King. However, the monarch, suspecting that Vazul inclined towards paganism, favored his own sister's son, Peter Orseolo. In order to ensure his nephew's succession, Stephen had Vazul blinded. Béla and his two brothers fled from the kingdom.
They first settled in Bohemia, but their "condition of life was poor and mean" there. They moved to Poland, where "they received a warm reception" from King Mieszko II. According to the Hungarian chronicles, Béla participated in a Polish expedition against the pagan Pomeranians and defeated their duke "in single combat". The Illuminated Chronicle narrates that the Polish monarch "praised the boldness and strength of Duke Béla and bestowed on him all the Pomeranian tribute". The King even gave his daughter—named either Richeza or Adelaide—in marriage to Béla and granted "a goodly quantity of land" to him. Makk says that Béla was not baptized until just before his marriage; his baptismal name was the Germanic[not in citation given] one of Adalbert.
At that time the Pomeranians refused to pay their yearly tribute to the Duke of Poland, to whom they were subject. The Duke set out to exact by force of arms the tribute due to him from the Pomeranians. Then the Pomeranians, who were pagans, and the Poles, who were Christians, agreed together that their leaders should meet each other in a duel, and if the Pomeranian fell defeated, he would render the customary tribute; and if the Pole, then he might bewail its loss. Since [the] Duke [Mieszko] and his sons shrank in fear from the duel to be fought, [Béla] presented himself before them and through an interpreter spoke thus: 'If it is pleasing to you, Poles, and to the lord Duke, although I am of nobler birth than that pagan, yet I will fight for the advantage of your kingdom and for the honour of the Duke.' This was pleasing both to the Pomeranians and to the Poles. When they met in combat, armed with lances, [Béla] is said to have struck the Pomeranian so manfully that he unseated him from his horse; and the Pomeranian could not move from the spot where he had fallen, and [Béla] smote him with his sword. Then the Duke of the Pomeranians confessed himself at fault; and the Pomeranians, seeing this, humbly submitted to the Duke of Poland and paid the accustomed tribute without murmuring.
King Mieszko II died in 1034; his son and heir, Casimir was forced to leave Poland. A period of anarchy followed, which lasted at least until 1039 when Casimir returned. According to Kristó and Makk, Béla was staying in Poland during this period; he even may have administered the kingdom in the name of his absent brother-in-law. On the other hand, the Polish historian, Manteuffel writes that Béla and his two brothers, in contrast with the unanimous report of the Hungarian chronicles, arrived in Poland only with Casimir, after 1039. It is beyond a doubt that Levente and Andrew departed from Poland in about 1038, because—according to the Illuminated Chronicle—they did not want to "live the life of hangers-on in the Duke of Poland's court, regarded only as Béla's brothers".
Upon leaving Poland, Andrew and Levente settled in Kiev. They returned to Hungary after a rebellion which was dominated by pagans broke out against King Peter Orseolo in 1046. The King was dethroned, and Andrew was proclaimed king. Levente died in the same year and Andrew, still childless, decided to invite Béla back to Hungary.
Having lost one brother, King Andreas sent to Poland to his other brother Bela, calling him with great love and saying: "Once we shared poverty and labour together, and now I ask you, most beloved brother, that you come to me without tarrying, so that we may be companions in joy and share in the good things of the kingdom, rejoicing in each other's presence. For I have neither heir nor brother except you. You shall be my heir, and you shall succeed me in the kingdom." Won by these words, Béla came to the King with all his family. When the King saw him, he rejoiced with a great joy, because he was fortified by his brother's strength. Then the King and his brother Bela held a council and divided the kingdom into three parts, of which two remained under the proprietorship of the royal majesty or power and the third was put under the proprietorship of the Duke. This first division of the kingdom became the seed of discord and wars between the dukes and the kings of Hungary.
Urged by his brother, Béla returned in 1048 and received one-third of the kingdom, with the title of duke. Béla's ducatus or "duchy" encompassed large territories along the eastern and northern borders, including the regions of Nyitra (Nitra, Slovakia) and Bihar (Biharia, Romania). He possessed a wide range of royal prerogatives, including coinage. The half-denars minted for him bore the inscription BELA DUX ("Duke Béla"). According to Steinhübel, the mid-11th-century timber and earth walls of the fortress of Nyitra were erected in Béla's reign.
The two brothers closely collaborated in the subsequent years. According to the Illuminated Chronicle, they together worked out a military strategy against the Germans, who were frequently invading the kingdom in the early 1050s. Ferenc Makk writes that Béla's epithets—the Champion or the Wisent—are connected to his fighting against the Germans. The chronicler emphasizes that Andrew and Béla "lived in a great tranquillity of peace" even after Andrew fathered a son, Solomon, in 1053. Béla was one of the lords witnessing the deed of the foundation of the Tihany Abbey, a Benedictine monastery that his brother established in 1055.
The two brothers' good relationship deteriorated after King Andrew had the child Solomon crowned king in 1057 or 1058. The coronation was the consequence of the peace negotiations with the Holy Roman Empire, because the Germans did not acquiesce in a marriage between Solomon and Judith—the sister of the young German monarch, Henry IV—until Solomon's right to succeed his father was declared and publicly confirmed. Thereafter Andrew was determined to secure the throne for his son. He invited Béla to his manor in Tiszavárkony, where the King offered his brother a seemingly free choice between a crown and a sword (which were the symbols of the royal and ducal power, respectively). However, he had ordered that Béla be murdered if he chose the crown. Having been informed of his brother's secret plan by one of his own partisans in the royal court, Béla opted for the sword, but he departed for Poland after the meeting.
He returned to Hungary, in the autumn of 1060, with Polish troops that Duke Boleslaus the Bold of Poland had provided. Around the same time, German reinforcements arrived in Hungary to assist Andrew against Béla. The ensuing civil war ended with the victory of Béla, who defeated his brother in two successive battles fought at the river Tisza and at Moson. The King was seriously injured and died soon afterward. His partisans took his son, the child Solomon, to Germany.
Béla was crowned king in Székesfehérvár on 6 December 1060. He ordered that "the wives and sons and all the property of all those who had followed" his nephew to Germany "should be protected and kept safe and sound", which induced many of Solomon's partisans to reconcile themselves to Béla's rule and return to Hungary. He reformed the coinage and introduced "large coins of purest silver" into circulation. In order to stabilize the new currency, Béla maximized the prices and eliminated the black market. He also ordered that weekly markets should be held on Saturdays, instead of Sundays, in the kingdom. The historian Nora Berend says that the latter measure "may have adversely affected Jewish activities", because Jews, who observed the Sabbath, could not work on Saturdays.
Béla decided to discuss his innovations with the representatives of the freemen, and "sent heralds throughout all Hungary to summon two elders with gift of speech from each village to a royal council", according to the Illuminated Chronicle. A great crowd of commoners gathered in Székesfehérvár in 1061. They demanded the restoration of paganism and the murder of clergymen, but Béla collected his army and suppressed their uprising within three days.
Béla attempted to conclude a peace treaty with the Holy Roman Empire. For this purpose, shortly after his coronation, he released all German commanders who had assisted his brother during the civil war. However, the young German monarch's advisors refused Béla's proposals. In the summer of 1063, an assembly of the German princes decided to launch a military expedition against Hungary to restore young Solomon to the throne. Béla was planning to abdicate in favor of his nephew if the latter restored his former ducatus, but he was seriously injured when "his throne broke beneath him" in his manor at Dömös. The King—who was "half-dead", according to the Illuminated Chronicle—was taken to the western borders of his kingdom, where he died at the creek Kinizsa on 11 September 1063. Béla was buried in the BenedictineSzekszárd Abbey, which he had set up in 1061. Following Béla's death, his three sons—Géza, Ladislaus and Lampert—sought refuge in Poland, and Solomon ascended the throne.