Sibyl Marshall
- Born: Abt 1191, Pembroke, Pembrokeshire, Wales
- Marriage: William de Ferrières 5th Earl of Derby 141
- Died: Bef 1238, England
General Notes:
William de Ferrers married, 1st, before 14 May 1219 Sibyl, sister and in her issue coheir of Walter, Earl of Pembroke, and 3rd daughter of William le Mareschal, EArl of Pembroke, by Isabel, suo jure Countess of Pembroke, daughter and eventually heir of Richard Fitz Gilbert, Earl of Pembroke.
~Cokayne's Complete Peerage, 2nd Edition, (Ferrières), Vol. IV, pp. 196-198, Vol. XIV, p. 250 141
Sibyl married William de Ferrières 5th Earl of Derby, son of William de Ferrières 4th Earl of Derby and Agnes of Chester Lady of Chartley.141 (William de Ferrières 5th Earl of Derby was born about 1193 in Derby, Derbyshire, England, died Shortly before 12 Mar 1254 in Evington, Leicestershire, England 141 and was buried on 31 May 1254 in Merevale Abbey, Merevale, Warwickshire, England 141,529.)
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