William de FERRERS & Sibyl MARSHAL 
They had a daughter named Isabel de.
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Personal Details
William de FERRERS
William de was born in 1193 in Derbyshire, England. He died at the age of 61 on March 24th, 1254.
Sibyl MARSHAL
Sibyl was born in 1209 in Pembroke, Wales. She died at the age of 36 on April 27th, 1245.
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Children
Isabel de FERRERS
Isabel de was born about 1222 in Derbyshire, England. She died on November 26th, 1260 in derbyshire, England.