John III of Trebizond

John III Megas Komnenos
Reign	1342-1344
Successor	Michael Megas Komnenos
Born	c.1321
Died	1362
Father	Michael Megas Komnenos
Mother	Acropolitissa

John III Megas Komnenos or Grand Comnenus (Greek: Ἰωάννης Γ΄ Μέγας Κομνηνός, Iōánnēs G′ Mégas Komnēnós; 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. When Michael became Emperor of Trebizond for a day in 1341 and was quickly deposed and imprisoned by megas doux John the Eunuch, John was still in Constantinople. However, in 1342 the leaders of the Scholarioi, Niketas Scholares and Gregory Meitzomates, visited him there and persuaded the young man to come with them to Trebizond and take the throne. With the approval of the Byzantine government, the group set out for Trebizond in September 1342 after enlisting the support of three Genoese galleys, bringing their little fleet to a total of five ships. After a short but fierce fight John and his supporters captured the city on September 4, aided by a popular uprising in their favor. After the coronation of John III as emperor, the deposed Empress Anna Anachoutlou was strangled, and her noble supporters executed or exiled shortly following John's coronation in Panagia Chrysokephalos Church.

Both William Miller and George Finlay describe John III as a weak and dissolute ruler, who cared only for entertainment, self-indulgence, and luxury; he showed no over his own father who remained the prisoner of megas doux John the Eunuch. Upon the death of the megas doux, Niketas marched to Limnia where he freed Michael then returned with him to Trebizond to depose John. On May 3, 1344 John was banished to the monastery of St. Sabas (where he was kept under a Byzantine guard) and his father was restored to the throne.

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