SIBYL Corbet ([1090/95]-after 1157). The Complete Peerage deduces her parentage, relationship with King Henry, and her marriage from a charter, dated to [1163/75], of her son "Reginaldus, Henrici Regis filius, comes Cornubiæ" by which he granted property to "Willielmo de Boterell, filio Aliziæ Corbet, materteræ meæ" which he had granted to "Willielmo de Boterells in Cornubia, patri…predicti Willielmi" on his marriage, witnessed by "Nicholao filio meo…Herberto filio Herberti, Baldwino et Ricardo nepotibus meis, Willelmo de Vernun, Willielmo fratre meo…Hugone de Dunstanvill…"[2733]. The [1125/35] birth date range estimated for her son Herbert, born from this marriage, suggests that she married after her relationship with the king. Lady of Alcester and Pontesbury. The Pipe Roll of 1157 records a payment to "the mother of Earl Reginald" from an estate at Mienes, Sussex[2734]. Mistress ([1110/15]) of HENRY I King of England, son of WILLIAM I "the Conqueror" King of England & his wife Mathilde de Flandre (Selby, Yorkshire Sep 1068-Château de Lyon-la-Forêt, near Rouen 1 Dec 1135, bur Reading Abbey, Berkshire). m ([1115/25]) HERBERT FitzHerbert, son of HERBERT FitzHenry & his first wife Emma de Blois (-before 1165).