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Family William III FERRERS [Earl of Derby] [Earl of D & Sibyl MARSHALL Click to view William III FERRERS [Earl of Derby] [Earl of D & Sibyl MARSHALL in the family tree

William III and Sibyl were married in a religious ceremony before May 14th, 1219 in Of,Pembroke,Pembrokeshire,Wales.  They had a son and seven daughters, named John De, Agnes De, Isabella De, Maud (Matilda) De, Sibyl De, Joan De, Agatha De and Eleanor De.

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