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Male William I de Ferrers , 3rd Earl of Derby Click to view William I de Ferrers , 3rd Earl of Derby in the family tree

William I de was born in 1140 in Ferrers, Derbyshire, England.  William I de's father was Robert de Ferrers , 2nd Earl of Derby and his mother was Margaret Peverel.  His maternal grandmother was Avice de Lancaster.  He was an only child.  He died before October 21st, 1190 in Seige of Acre, Jerusalem, Palestine.

William I de's family with Sybil de Braose

‌William I de and Sybil de were married in a religious ceremony about 1167 in Sussex, England.  They had a son and three daughters, named William II de, Agatha de, Millicent de and Pernell (Petronella) de.

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