Tags: Monarch.

John IV Megas Komnenos (Greek: Ιωάννης Δ΄ Μέγας Κομνηνός Iōannēs IV Megas Komnēnos) (c. 1403 – 1459) was Emperor of Trebizond from 1429 to 1459. He was a son of Emperor Alexios IV of Trebizond and Theodora Kantakouzene.

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