William de Vesci (c.1125–1184) was an Anglo-Norman feudal lord and Sheriff. Born William fitz Eustace at Knaresborough Castle, Yorkshire, the son of Eustace Fitz John and Beatrix de Vesci, he took his mother's surname.
William de Vesci
|Noble family||de Burgo|
|Father||Eustace fitz John|
|Mother||Beatrix de Vesci|
In 1174, he joined other knights such as Bernard de Balliol and Robert III de Stuteville under the command of Ranulf de Glanville, Sheriff of Westmorland to attack an invading Scottish army then besieging Alnwick castle in Northumberland. The Scottish king William I of Scotland (William the Lion) was captured and the invasion successfully repelled. 
Marriage and issueEdit
He married Burga de Stuteville, daughter of Robert III de Stuteville, they had the following known issue:
- Maud, married Thomas de Muschamp and also Adam de Karliolo
- Eustace, died 1216. He married Margaret, illegitimate daughter of William the Lion, King of Scotland.
- Richard of Chimley
- Warin of Knapton, married Matilda de Wellon, had issue.
He also allegedly fathered an illegitimate daughter Sibil, who married Walter de Bolbec.
- Burke, John (1831). A general and heraldic dictionary of the peerages of England, Ireland, and Scotland By John Burke. Retrieved 25 July 2011.