William la Zouche, 1st Baron Zouche

William la Zouche
1st Baron Zouche of Harringworth
Arms of la Zouche of Harringworth: Gules, ten bezants a canton ermine for difference. These are the differenced arms of Zouche of Ashby
Spouse(s)	Maud Lovell Joan Leybourne
Father	Eudo la Zouche
Mother	Millicent de Cantilupe
Born	1277 Harringworth,Northamptonshire
Died	10 March 1352

William la Zouche, 1st Baron Zouche (1276/86-1352) lord of the manor of Harringworth in Northamptonshire, was an English baron and soldier who fought in the Wars of Scottish Independence. He is referred to in history as "of Harringworth" to distinguish him from his first cousin (of the senior line) Alan la Zouche, 1st Baron la Zouche (1267-1314) of Ashby de la Zouche in Leicestershire.

William was the son of Eudo la Zouch (d.1279) (uncle of Alan la Zouche, 1st Baron la Zouche of Ashby (1267-1314)) by his wife Millicent de Cantilupe (d.1299), widow of John de Mohaut (Latinized to de Monte Alto), daughter of William III de Cantilupe by his wife Eva de Braose, 3rd daughter and co-heiress of William de Braose, Baron Bergavenny. Millicent de Cantilupe was a great heiress, being a co-heir to her brother George de Cantilupe (d.1273), Baron Bergavenny, feudal baron of Totnes in Devon (formerly held by de Braose), she was heiress of the English feudal barony of Eaton Bray (formerly held by Cantilupe) and of the manor of Harringworth, amongst many other lands.

William's younger brother was Roger la Zouch, Lord of Lubbesthorpe (d.1303), father of Roger la Zouch the instigator of the murder of Roger de Beler in 1326. William's sister, Eva la Zouch, was married to the rebel Maurice de Berkeley, 2nd Baron Berkeley who was imprisoned in Wallingford Castle and died there also in 1326.