The title Baron Mordaunt was created in 1529 for Sir John Mordaunt. The fifth baron was created Earl of Peterborough in 1628 and the title then passed to his son, the second earl, in 1644. On his death in 1697, the earldom was inherited by the his nephew, Charles and the barony was inherited by his only child, Mary, the estranged wife of the 7th Duke of Norfolk. When she died childless in 1705, the barony was also inherited by Charles, who had also been created Earl of Monmouth.
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