William de Ferrers, 3rd Earl of Derby, was born on an unknown date to Robert de Ferrers, 2nd Earl of Derby (-1162) and Margaret Peverel (c1144-?) and died before 21 October 1190 Siege of Acre (1189–1191) of unspecified causes. He married Sibylla de Braose (-1227) .


Offspring of William de Ferrers, 3rd Earl of Derby and Sibylla de Braose (-1227)
Name Birth Death Joined with
William de Ferrers, 4th Earl of Derby (c1168-c1247) 1168 1247 Agnes de Kevelioch (c1174-1247)
Robert de Ferrers (-1227) 1169 England 1227 England Joan de Boclande (-c1227)
Millicent de Ferrers (c1171-c1190)
Agatha de Ferrers (c1175-?)
Petronella de Ferrers (c1191-aft1237) 1191 1237 Hervey de Stafford (-1237)

Footnotes (including sources)

‡ General