Constantine Phipps, 1st Baron Mulgrave (22 August 1722 (baptised)[1] – 13 September 1775) was an Irish peer.
In 1767 he was created Baron Mulgrave, of New Ross in the County of Wexford, in the Peerage of Ireland.
Lady Catherine Annesley was the daughter and heiress of James Annesley, 3rd Earl of Anglesey, by his wife, Lady Catherine Darnley (an illegitimate daughter of King James II by his mistress Catherine Sedley, Countess of Dorchester).
Lady Catherine Darnley had later married John Sheffield, 1st Duke of Buckingham and Normanby, making Constantine Phipps, 1st Baron Mulgrave, a step-grandson of the 1st Duke of Buckingham and Normanby.
[4] Right Honourable Constantine Phipps aged 54 was buried on 5 October 1775 at Croydon, St John, Surrey, England[5]