Sheridan Frederick Terence Hamilton-Temple-Blackwood, 5th Marquess of Dufferin and Ava (9 July 1938 29 May 1988) was a British patron of the arts. Less formally he was usually called Sheridan Dufferin.Born into an Anglo-Irish family from Ulster, he was the youngest child and only son of the 4th Marquess of Dufferin and Ava and his wife, Maureen Guinness. One of his sisters was the novelist Caroline Blackwood.Named after his playwright ancestor Richard Brinsley Sheridan, Lord Dufferin was known by his father's courtesy title Earl of Ava until he succeeded his father in the marquessate in 1945, when he was only 6 years-old. When he was aged 12, trustees acting in his name sold Clandeboye, his ancestral seat, to his estates company for Pds. 120,000 in order "to maintain his station in life," as the trustees allegedly said at the time.