Colonel William Graydon 817
- Born: 27 December 1820, Ireland
- Christened: 1820, Tarbert, Co. Kerry
- Marriage: Charlesanna Posthema Penruddocke on 26 September 1865 in Milton Lilbourne, Wiltshire
 General Notes:
Bengal Cavalry.
William married Charlesanna Posthema Penruddocke, daughter of Charles Penruddocke and Juliana Laetitia Penruddocke, on 26 September 1865 in Milton Lilbourne, Wiltshire. (Charlesanna Posthema Penruddocke was born on 17 February 1840 in 11 Grosvenor Place, Bath, Somerset, christened on 18 March 1840 in 11 Grosvenor Place, Bath, Somerset and died on 9 October 1911 in Andover, Hampshire 12.)
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