William de FERRERS, (EARL OF DERBY)
Royal Ancestors of Some LDS Families, Call, (1975), Supp. E, p. 115; Ancestral File
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He married Sibyl Marshall Abt 1223 at of Derbyshire, England . Sibyl Marshall was christened at St. David's, Pembrokeshire, Wales 1209 daughter of William Marshall, (Earl of Pembroke) and Isabel Fitz Gilbert de Clare, (Countess of Pembroke) .
They were the parents of 8
children:
Maud de Ferrers
born Abt 1228.
Agatha de Ferrers
born Abt 1234.
Eleanor de Ferrers
born Abt 1236.
Agnes de Ferrers
born Abt 1224.
Isabella de Ferrers
born Abt 1226.
Sibyl de Ferrers
born 1230.
Joan de Ferrers
born Abt 1232.
John de Ferrers
born Abt 1238.
William de Ferrers, (Earl of Derby) died 24 Mar 1254 at At Evington .
Sibyl Marshall died 27 Apr 1245 .