Sybil de Braose Countess of Derby

✓ Sibyl, 'da. of William de Braiose, Lord of Bramber, by Bertha (heiress of Brecon and Over Gwent), sister and coh. of William de Hereford, and 2nd da. of Miles (de Gloucester), Earl of Hereford'; wife of William de Ferrieres, 3rd Earl of Derby (d. on crusade at the siege of Acre 1190, before 21 Oct); named with him in his 1189 gift to St Denis ('pro salute anime mee et Sibille Comitisse uxoris mee') and in his Tutbury charter; survived him many years (Testa de Nevill p.108) and was perhaps the widow Sibilla de Ferrariis of 5 Feb 1227/8: CP IV 'Derby' pp.193-194. Mother of William, 4th Earl (I100493). Her parents are already in the tree (F100420) - RING 27 Oct 2026 to Braose of Bramber. Source: Complete Peerage 2nd ed. vol. IV (1916), 'Derby' pp.191-194 and Appendix I 'Peverel of Nottingham' pp.761-767 (archive.org completepeerageo04coka), read 27 Oct 2026. [DIRECT ANCESTOR OF THE COMPILER: flag added 27 Oct 2026 by walking the tree from Aynsley, so that this marker is reliable and can be searched.]