William de Grandison, 1st Baron Grandison
William de Grandison, was an English noble.
William was a younger son of Pierre de Grandison and Agnes Neufchâtel. He served in the household of Edmund, Earl of Lancaster and was active in the wars in Gascony and Scotland. During 1292, he was granted a license to crenellate his manor of Asperton, Gloucestershire.William married Sybil, daughter of John de Tregoz and Mabel FitzWarin, they are known to have had the following known issue:
- Piers de Grandison, married Blanche Mortimer.
- John de Grandison, Bishop of Exeter.
- Otho de Grandison, married Beatrice Malmayns, had issue.
- Mabel de Grandison, married John de Pateshull, had issue.
- Katherine de Grandison, married William Montagu, 1st Earl of Salisbury, had issue.
- Agnes de Grandison, married John Northwode, had issue.
- Maud de Grandison
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