Sir William de Fiennes Knight
- Marriage: Joan de Say 900
- Died: 12 Dec 1359, France
 Noted events in his life were:
• Background Information. 900
Sir William de Fiennes, Knight, heir to his brother John & son of Sir William de Fiennes and his wife Maud de Monceaux , and died 34 Edward III leaving issue, by Joan his wife, daughter and coheir of Geoffry Lord Say, lord admiral of England, two sons, John who died without issue, 2 Richard II and Sir William.
~Collins's Peerage, Vol. VI, p. 565
William married Joan de Say, daughter of Sir Geoffrey de Say Knight, Baron de Say and Maud de Beauchamp.900 (Joan de Say died on 29 Jun 1378 in Canterbury, Kent, England.)
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