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Family Earl of Derby William V De Ferrers Earl of Derby & Sibyl Marshall Click to view Earl of Derby William V De Ferrers Earl of Derby & Sibyl Marshall in the family tree

William V and Sibyl were married in a religious ceremony before May 14th, 1219 in Pembroke, Pembrokeshire, Wales.  They had six daughters named Eleanor, Isabel, Joan, Maud, Sibyl and Agnes.

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