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Sir Rhys Mansel (c. 1487 – 1559), also Sir Rice Mansel, also Sir Rice Manxell, also Sir Rice Maunsell, Vice-Admiral, was High Sheriff of Glamorgan, a Commissioner of Peace and served as Chamberlain of Chester to King Henry VIII of England. He was High Sheriff of Glamorgan for 1542.
Sir Rice owned estates at Penrice and Oxwich, and at the Dissolution of the Monasteries he purchased Margam Abbey, which remained the property of his descendants until 1941. His son, Sir Edward Mansel (died 1595) married Jane Somerset, daughter of the Earl of Worcester, and was the father of Robert Mansell sailor and glass-making entrepreneur.
- William Llewelyn Davies. "Mansel family, of Oxwich, Penrice, and Margam Abbey, Glamorganshire". Dictionary of Welsh Biography. National Library of Wales. Retrieved 15 February 2020.
- Maunsell, Charles Albert and Statham, Edward Phillips, History of the Family of Maunsell (Mansell, Mansel) , 2 vols. in 3, Anchor Press LTD, Tiptree Essex, 1917-20.