An Anglo-Irish aristocrat, he is the son of Benjamin Guinness, 3rd Earl of Iveagh and Miranda Guinness.
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He was one of the ecclesiastical commissioners for Ireland, a governor of Simpson's Hospital, and vice-chairman of the Dublin Exhibition Palace.
Lord Iveagh married Miranda Daphne Jane Smiley, daughter of Major Michael Smiley, of Castle Fraser, Kemnay, Aberdeenshire, on 12 March 1963.