Question: What is the date of death of John Iv Of Trebizond's mother?
Sentence (from "John IV of Trebizond"): (΄ Μέγας Κομνηνός, "Iōannēs IV Megas Komnēnos") (1403 – c.1459) was Emperor of Trebizond from 1429 until his death.
Relevant evidence: No