Marshall, Sybilla (fl. 1230)

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Marshall, Sybilla (fl. 1230)

Countess of Derby . Name variations: Sibyl Marshal. Flourished around 1200; daughter of Isabel de Clare (c. 1174–1220) and William Marshall (b. 1146), 4th earl of Pembroke; sister of Maud Marshall (d. 1248); married William de Ferrers, 6th earl of Derby; children: Agnes de Ferrers (d. 1240, who married William de Vesci); Isabel de Ferrers (d. 1260); Maud de Ferrers (d. 1299); Sibyl de Ferrers ; Jean de Ferrers (d. 1267); Agatha de Ferrers (d. 1306).