Beloš, was a Serbian prince and Hungarian palatine who served as the regent of Hungary from 1141 until 1146, alongside his sister Helena, mother of the infant King Géza II. Beloš held the title of duke, and served as ban of Croatia from 1142 until 1158 and briefly in 1163. Beloš, as a member of the Serbian Vukanović dynasty, also briefly ruled his patrimony as the Grand Prince of Serbia in 1162. He lived during a period of Serbian-Hungarian alliance, amid a growing threat from the Byzantines, who had earlier been the overlords of Serbia.
His sister Helen, married the Hungarian heir apparent, Béla II in 1129. In 1131, Béla II was crowned the King of Hungary, succeeding the child-less Stephen II. Beloš joined his sister at the Hungarian court, and received the title of dux. Béla II died on 13 February 1141, and the eldest son and heir Géza II was still a child, thus Helen and Beloš became regents in his place. The brother and sister governed the Kingdom of Hungary until Géza II's coming of age, in September 1146. In 1145, he received the title of comes palatinus, the highest court title of the Kingdom. During his time as tutor to Géza II, the Byzantine Emperor Manuel I Comnenus attacked Hungary, supporting the rival Boris Kalamanos, however Beloš successfully managed to defend Hungary.
Beloš received the title of Ban of Croatia and Dalmatia, as a viceroy in Croatia, in 1142. In 1149, Géza II and Beloš aids Uroš II in the attacks of Emperor Manuel I on Serbia. In 1154, he assists Ban Borić of Bosnia to conquer Braničevo from the Byzantines. In 1158 he leaves Hungary and returns to Serbia. When Manuel I had removed his brother Uroš II in 1161, Beloš came to rule briefly in 1162, then gave the throne to his younger brother Desa. He returns to Croatia, once again serving as Ban of Croatia. After the death of Géza II in 1162, Byzantines wanted to instate a member of the dynasty, Stephen IV, who had lived in Constantinople. Beloš ousts Stephen IV after he briefly rules, taking him as prisoner. He releases Stephen IV to the Byzantines after an agreement.
Later years
He married his daughter to the Russian prince Vladimir III Mstislavich in 1150. He founded a monastery in present-day Banoštor, which made the locals call the townBanov manastir, hence the modern name Banoštor. Throughout his tenure in Hungary, he maintained excellent relations with Serbia, which was ruled by his brothers. After 1163 there are no more mentions of him.
