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Family William III de Ferrers , 5th Earl of Derby & Sibyl Marshal Click to view William III de Ferrers , 5th Earl of Derby & Sibyl Marshal in the family tree

William III de and Sibyl were married in a religious ceremony before May 14th, 1219 in 1st wife.  They had five daughters named Isabel de, Agnes de, Maud (Matilda) de, Eleanor de and Joan de.

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