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Major The Rt. Hon. William Charles Yelverton, 4th Viscount Avonmore (27 September, 1824 – 1 April, 1883 in Biarritz), was an Irish nobleman and soldier. He was the son of The 3rd Viscount Avonmore and Cecilia O'Keeffe. Major William Charles Yelverton gained the rank of Major in the service of the Royal Artillery. He was invested as a Knight, Order of the Medjidie 5th class. He was usually known to family and friends as Charles.