William de Say
- Marriage: Sibyl Marshal
- Died: 12 Feb 1271
 Noted events in his life were:
• Travel: Accompanied, Apr 1230, France. Accompanied his father to France
• Witnessed: Treaty between Henry III and Alexander II of Scotland, 1237, England.
• Military Service: Accompanied Henry III, 1242, France. Captured Seven French prisoners in a skirmish at Saintes 22 July 1242
• Military Service: Accompanied Henry III, 1253-1254, France.
• Military Service: Battle of Lewes, 1264, Lewes, Sussex. Fought for Henry III
William married Sibyl Marshal, daughter of John Marshal and Unknown. (Sibyl Marshal died on 20 Nov 1253.)
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