He was the son of The 3rd Viscount Avonmore and Cecilia O'Keeffe .
William Charles Yelverton , 4th Viscount Avonmore ( 27 September 1824 -- 1 April 1883 , Biarritz ) , was an Irish nobleman and soldier .
William Charles Yelverton was the nobleman of The 3rd 4th Viscount Avonmore   and Cecilia O'Keeffe .
William Charles Yelverton , 4th Viscount Avonmore ( 27 September 1824 -- 1 April 1883 , Biarritz ) , was an Irish nobleman and soldier .