B%C3%A9la III of Hungary

Bla III was King of Hungary and Croatia between 1172 and 1196. He was the second son of King Gza II and Gzas wife, Euphrosyne of Kiev. Around 1161, Euphrosyne granted Bla a duchy, which included Croatia, central Dalmatia and possibly Sirmium. In accordance with a peace treaty between his elder brother, Stephen III, who succeeded their father in 1162, and the Byzantine Emperor Manuel I Komnenos, Bla moved to Constantinople in 1163. He was renamed to Alexios, and the emperor granted him the newly created senior court title of despotes. He was betrothed to the Emperors daughter, Maria. Blas patrimony caused armed conflicts between the Byzantine Empire and the Kingdom of Hungary between 1164 and 1167, because Stephen III attempted to hinder the Byzantines from taking control of Croatia, Dalmatia and Sirmium. BlaAlexios, who was designated as Emperor Manuels heir in 1165, took part in three Byzantine campaigns against Hungary. His betrothal to the emperors daughter was dissolved after her

Bla was the second son of Gza II of Hungary and Gzas wife, Euphrosyne of Kiev. The date of his birth was not recorded. Studies of his bones show that Bla died in 1196 at around 49 years old, showing that he had been born around 1148.

Source: Wikipedia