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Male William I de Montacute , Earl of Salisbury 1st Click to view William I de Montacute , Earl of Salisbury 1st in the family tree

William I was born in 1302 in Cassington, Oxfordshire, England.  William I's father was William de Montacute , Baron Montagu 2nd and his mother was Elizabeth de Montfort.  His paternal grandfather was Simon de Montague , 1st Baron Montagu and his paternal grandmother is Hawise de St. Amand; his maternal grandfather was Peter de Montfort , Sir and his maternal grandmother is Maud de La Mare. He had a brother and a sister, named John and Alice.


William I's family with Katherine de Grandeson

They had two sons and two daughters, named John, William II, Philippa and Sibyl.

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