Question: What nationality is Humphrey Stafford, Earl Of Stafford's father?
Sentence (from "Humphrey Stafford, 1st Duke of Buckingham"): Partly due to a feud with a leading Yorkist—Richard Neville, Earl of Warwick—Stafford eventually declared for King Henry and the Duke of York was defeated in 1459, driving York into exile.
Relevant evidence: No