Which third cousin of Henry VIII had a great-grandfather who had a deadly rivalry with Richard Plantagenet?
Eleanor Carey: Eleanor Carey (c. 1495 – after 1528) was the daughter of Sir Thomas Carey of Chilton Foliat and his wife Margaret Spencer. Edmund Beaufort, 2nd Duke of Somerset:  He was known for his deadly rivalry with Richard Plantagenet, 3rd Duke of York.
i don't know