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Belo , was a Serbian prince and Hungarian palatine who served as the Regent of Hungary in 11411146, alongside his sister Helena, the queen consort of King Bla II with whom she had a son, Gza II, still an infant upon succession. Belo held the title of duke , and served as the viceregal of Croatia in 11421158 and briefly in 1163. Belo, as a member of the Serbian Vukanovi dynasty, also briefly ruled his patrimony as the Grand Prince of Serbia in 1162. He lived during a period of SerbianHungarian alliance, amid a growing threat from the Byzantines, who had earlier been the overlords of Serbia.

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Source: Wikipedia