Beloš (Serbian Cyrillic: Белош; Hungarian: Belos or Belus; Greek: Βελούσης fl. 1141–1163), 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 (dux), and ban of Croatia from 1146 until 1157 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.
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Beloš of Serbia in the context of Desa of Serbia
Desa (Serbian Cyrillic: Деса) was the Grand Prince of Serbia from ca. 1162 to ca. 1165. He was one of several sons of grand prince Uroš I (d. 1145). Sometime between 1153 and 1155, Desa tried to depose his brother, the ruling grand prince Uroš II, but failed to establish himself as a new ruler. Only later, after the abdication of their other brother, the next grand prince Beloš ca. 1162, Desa became the new ruler of Serbia. He tried to challenge the Byzantine suzerainty over Serbia, but was deposed by emperor Manuel I Komnenos. Before he became the grand prince, Desa ruled as prince of Duklja, Travunija and Zahumlje, ca. from 1149 to 1162.