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 • Dureford Abbey
 • Rogate
 • Chichester District
 • West Sussex
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Sir William de Clare
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Birth: May 18, 1228, England
Death: Jul. 23, 1258
West Sussex, England

Knight of Petersfield, Mapledurham and Sunworth in Buriton, Hampshire, of Walsingham, Wells amd Warham, Norfolk. Constable of Winchester Castle.

Second son of Sir Gilbert de Clare and Isabel Marshall, grandson of Sir Richard de Clare, Earl of Hertford and Amice FitzWilliam of Gloucester, Sir William Marshall, Earl of Pembroke and Isabel FitzRichard.

When William was knighted, his brother, Richard, had a great tournament in his honour in November of 1247. The following year, William accompanied his brother, now Earl Richard to St Edmund's at Pontigny, Yonne, France. William was awarded free warren of his demense lands at Petersfield and Mapledurham the same year. William was granted a weekly market and yearly faire at his manor, Little Walsingham in 1252, increased to two yearly faires at Petersfield in 1255. In 1256, William received an annuity of 100 marks and free warren of his other lands in 1257, as well as a weekly market at Little Walsingham.

In May of 1258, he and his brother, Richard, were having breakfast at Winchester with Prince Edward (son of Henry III whom William's father fought at the Battle of Lewes in 1264), where they brothers were poisoned by Richard's steward, Walter de Scotenay, executed for the deed the following year. Richard recovered, losing his hair and nails, but William died from the poisoning, and was buried at Dureford Abbey, Sussex. 
Family links: 
  Gilbert de Clare (1182 - 1230)
  Isabel Marshal de Clare (1183 - 1240)
  Richard de Clare (1222 - 1262)*
  Isabel de Clare Le Brus (1226 - 1264)*
  William de Clare (1228 - 1258)
  John de Cornwall (1232 - 1233)**
  Isabella de Cornwall (1233 - 1234)**
  Henry de Almain (1235 - 1271)**
  Nicholas de Cornwall (1240 - 1240)**
*Calculated relationship
Dureford Abbey
Chichester District
West Sussex, England
Created by: Anne Shurtleff Stevens
Record added: Apr 21, 2013
Find A Grave Memorial# 108885858

In Loving Memory of 23rd Great-grandfather
- Vicki Cooper
 Added: May. 18, 2014

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