Question: What is the date of birth of Helena Kantakouzene's husband?
Sentence (from "John V Palaiologos"): John V Palaiologos or Palaeologus ("Iōannēs V Palaiologos"; 18 June 1332 – 16 February 1391) was a Byzantine emperor, who succeeded his father in 1341 at the age of eight.
Relevant evidence: Yes