Question: What is the date of death of Irene Asanina's husband?
Sentence (from "John VI Kantakouzenos"): John VI Kantakouzenos, Cantacuzenus, or Cantacuzene ("Iōannēs ST′ Kantakouzēnos"; ; – 15 June 1383) was a Greek nobleman, statesman, and general.
Relevant evidence: Yes