Guillaume was born about 1262, the son of unknown parents. The place is not known.
He died on 27 JUN 1335 in Lambourn, Hungerford, Berkshire, England.
His wife was Sybil de Tregoz. They were married, but the date and place have not been found. Their only known child was Piers (c1296-1358).
| Event | Date | Details | Source | Multimedia | Notes | ||
|---|---|---|---|---|---|---|---|
| Birth | ABT 1262 |
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| Death | 27 JUN 1335 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | 1299 | baron Grandison 1° |
Note 1
Guillaume=William de Grandson, went to England ca 1280s; he was summoned to Parliament 1299, whereby he is held to have become Baron Grandison