Question: Who is John Iii Of Trebizond's paternal grandmother?
Sentence (from "Michael of Trebizond"): Μιχαήλ Μέγας Κομνηνός, "Mikhaēl Megas Komnēnos"), (c. 1288– after 1355), Emperor of Trebizond for one day, July 30, 1341 and from May 3, 1344 to December 13, 1349.
Relevant evidence: No