Sibyl was the 3rd daughter of William le Mareschal, Earl of Pembroke and Isabel de Clare, suo jure Countess of Pembroke, daughter and eventually heir of Richard Fitz Gilbert, Earl of Pembroke. She was the sister and in her issue coheir of Walter, Earl of Pembroke,
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.
Their children were
Agnes, who married Sir William de Vescy, Lord of Alnwick, son of Sir Eustace de Vescy Lord of Alnwick
Isabel, who married Reynold (Reginald) II de Bohun Lord of Dunster, son of Reynold (Reginald) I de Bohun Lord of Dunster and Alice de Briwere.
Maud (Matilda), married firstly Simon IV de Kyme, Lord of Sotby, married secondly, William de Fortibus, Lord of Chewton, son of Hugh de Vonia, Baron of Chewton and Mabel Malet, about 1252 and last married Vcte Emery (Almery) de Rochechouart, before 4 Feb 1266-1267.
Joan married first Sir John I de Bohun of Dunster, son of Reynold (Reginald) II de Bohun Lord of Dunster and Hawise or Avice FitzGeoffrey, and second Sir Robert de Aguillon of Watton & Perching, son of Sir Robert de Aguillon of Watton & Addington and Margaret (Margery).
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.
Their children were
Agnes, who married Sir William de Vescy, Lord of Alnwick, son of Sir Eustace de Vescy Lord of Alnwick
Isabel, who married Reynold (Reginald) II de Bohun Lord of Dunster, son of Reynold (Reginald) I de Bohun Lord of Dunster and Alice de Briwere.
Maud (Matilda), married firstly Simon IV de Kyme, Lord of Sotby, married secondly, William de Fortibus, Lord of Chewton, son of Hugh de Vonia, Baron of Chewton and Mabel Malet, about 1252 and last married Vcte Emery (Almery) de Rochechouart, before 4 Feb 1266-1267.
Joan married first Sir John I de Bohun of Dunster, son of Reynold (Reginald) II de Bohun Lord of Dunster and Hawise or Avice FitzGeoffrey, and second Sir Robert de Aguillon of Watton & Perching, son of Sir Robert de Aguillon of Watton & Addington and Margaret (Margery).
Sibyl was the 3rd daughter of William le Mareschal, Earl of Pembroke and Isabel de Clare, suo jure Countess of Pembroke, daughter and eventually heir of Richard Fitz Gilbert, Earl of Pembroke. She was the sister and in her issue coheir of Walter, Earl of Pembroke,
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.
Their children were
Agnes, who married Sir William de Vescy, Lord of Alnwick, son of Sir Eustace de Vescy Lord of Alnwick
Isabel, who married Reynold (Reginald) II de Bohun Lord of Dunster, son of Reynold (Reginald) I de Bohun Lord of Dunster and Alice de Briwere.
Maud (Matilda), married firstly Simon IV de Kyme, Lord of Sotby, married secondly, William de Fortibus, Lord of Chewton, son of Hugh de Vonia, Baron of Chewton and Mabel Malet, about 1252 and last married Vcte Emery (Almery) de Rochechouart, before 4 Feb 1266-1267.
Joan married first Sir John I de Bohun of Dunster, son of Reynold (Reginald) II de Bohun Lord of Dunster and Hawise or Avice FitzGeoffrey, and second Sir Robert de Aguillon of Watton & Perching, son of Sir Robert de Aguillon of Watton & Addington and Margaret (Margery).
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.
Their children were
Agnes, who married Sir William de Vescy, Lord of Alnwick, son of Sir Eustace de Vescy Lord of Alnwick
Isabel, who married Reynold (Reginald) II de Bohun Lord of Dunster, son of Reynold (Reginald) I de Bohun Lord of Dunster and Alice de Briwere.
Maud (Matilda), married firstly Simon IV de Kyme, Lord of Sotby, married secondly, William de Fortibus, Lord of Chewton, son of Hugh de Vonia, Baron of Chewton and Mabel Malet, about 1252 and last married Vcte Emery (Almery) de Rochechouart, before 4 Feb 1266-1267.
Joan married first Sir John I de Bohun of Dunster, son of Reynold (Reginald) II de Bohun Lord of Dunster and Hawise or Avice FitzGeoffrey, and second Sir Robert de Aguillon of Watton & Perching, son of Sir Robert de Aguillon of Watton & Addington and Margaret (Margery).
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Siblings
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