William Yelverton, 4th Viscount Avonmore

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Major William Charles Yelverton, 4th Viscount Avonmore (27 September 18241 April 1883, Biarritz) was an Irish nobleman and soldier. He was the son of Barry John Yelverton, 3rd Viscount Avonmore and Cecilia O'Keefe. He married, firstly, Maria Theresa Longworth on 15 August 1857 in Rostrevor, County Down, Ireland. He married, secondly, Emily Marianne Ashworth, daughter of Maj.-Gen. Sir Charles Ashworth and Mary Anne Rooke, on 26 June 1858 in Trinity Chapel, Edinburgh, Midlothian, Scotland.

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.

Between 21 February 1861 and 4 March 1861 the trial of Thelwall v. Yelverton found that even though Major Yelverton was a Protestant, and Miss Longworth a Roman Catholic, and that they had been married by a Roman Catholic priest, the marriage was valid. In March 1861 he was suspended from all military duties. On 28 July 1864 on appeal, the decision of Thelwall v. Yelverton was reversed, and the House of Lords decided that William's first marriage was illegal, and that therefore his second marriage was valid.

The Major William Yelverton and Emily Marianne Ashworth had four children:

Peerage of Ireland
Preceded by
Barry John Yelverton
Viscount Avonmore
1870–1883
Succeeded by
Barry Nugent Yelverton