Tags: Monarch.
John III Megas Komnenos (Greek: Ιωάννης Γ΄ Μέγας Κομνηνός Iōannēs III Megas Komnēnos) (c. 1321–1362) was Emperor of Trebizond from September 4 1342 to May 3 1344. He was a son of Emperor Michael of Trebizond (who had reigned for a day in 1341) and Acropolitissa a daughter of Constantine Acropolites.John lived most of his life in Constantinople where his father had lived since c. 1297.