Question: Who is the father-in-law of Helena Kantakouzene, Empress Of Trebizond?
Sentence (from "Irene of Trebizond"): Irene of Trebizond( died around 1382) was the bigamous wife of Basil of Trebizond, by whom he had two sons, Alexios and John( later Alexios III of Trebizond), and possibly three daughters Anna, Maria and Theodora.
Relevant evidence: No