Question: When did Mary Howard, Duchess Of Norfolk (Died 1705)'s father die?
Sentence (from "Mary Howard, Duchess of Norfolk (died 1705)"): Born Lady Mary Mordaunt, she was the only child and heiress of Henry Mordaunt, 2nd Earl of Peterborough and Lady Penelope O'Brien, daughter of Barnabas O'Brien, 6th Earl of Thomond.
Relevant evidence: Yes