Mary Howard, Duchess of Norfolk (died 1705)
Mary Howard, Duchess of Norfolk and 7th Baroness Mordaunt (c.1659–17 November 1705) was a British peer.
Born Lady Mary Mordaunt, she was the only child and heiress of Henry Mordaunt, 2nd Earl of Peterborough. On 8 August 1677, she married Henry Howard, Earl of Arundel, who later succeeded his father as Duke of Norfolk in 1684. The duke and duchess separated a year later and she succeeded to her father's barony in 1697.
The duke and duchess were divorced in 1700, due to her adulterous relationship with Sir John Germain, 1st Baronet, whom she married a year later. She died without children from either marriage in 1705 and her title was inherited by her cousin, Charles, who had previously inherited her father's earldom.
Her memorial is in St Peter's Church, Lowick.
Rachel Weil, ‘Howard , Mary, duchess of Norfolk (1658/9–1705)’, Oxford Dictionary of National Biography, Oxford University Press, 2004, accessed 31 Dec 2006
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