Béla III of Hungary

Béla III of Hungary, born in 1148, was a significant political figure who reigned as King of Hungary and Croatia from 1172 to 1196. He was the second son of King Géza II and Euphrosyne of Kiev. In 1161, his father granted him a duchy that encompassed Croatia, central Dalmatia, and possibly Sirmium. Following a peace treaty between his elder brother, Stephen III, and Byzantine Emperor Manuel I Komnenos, Béla relocated to Constantinople in 1163, where he was renamed Alexios and awarded the title of despotes.

During his time in the Byzantine Empire, Béla's patrimony led to conflicts between Hungary and Byzantium from 1164 to 1167, as Stephen III sought to prevent Byzantine control over the contested territories. Designated as Manuel's heir in 1165, Béla participated in several military campaigns against Hungary. However, his betrothal to the emperor's daughter, Maria, was annulled after the birth of her brother, Alexios, in 1169, resulting in Béla being stripped of his high title and relegated to the rank of kaisar.

Upon the death of Stephen III on March 4, 1172, Béla returned to Hungary, pledging not to wage war against the Byzantine Empire. Despite opposition from Lucas, Archbishop of Esztergom, due to allegations of simony, he was ultimately crowned king on January 18, 1173, with the approval of Pope Alexander III. His reign was marked by a prolonged conflict with his younger brother, Géza, whom he imprisoned for over a decade.

Taking advantage of the internal strife within the Byzantine Empire after Manuel's death, Béla successfully reoccupied Croatia, Dalmatia, and Sirmium between 1180 and 1181. He also seized the Principality of Halych in 1188, although it was lost within two years. Béla's reign was notable for promoting the use of written records, with Hungarian chronicles attributing the establishment of the Royal Chancery to him. The royal palace in Esztergom, built during his rule, is recognized as the first example of Gothic architecture in Central Europe.

Regarded as the wealthiest monarch in Europe at the time, Béla's financial status is documented, though the accuracy of these records is debated. His legacy is one of both military ambition and cultural advancement, leaving a lasting impact on Hungary's history.