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Sybilla Corbet (Alcester 1077 – na 1157) was een Engelse edelvrouwe en een maîtresse van koning Hendrik I van Engeland. Ze was waarschijnlijk een dochter van Robert Corbet, heer (lord) van Alcester en een onbekende vrouw.

Ze huwde met Herbert FitzHerbert en kreeg samen met hem een zoon, eveneens Herbert FitzHerbert genaamd. Als maîtresse van de koning was ze moeder van Sybilla van Normandië en Reginald van Dunstanville. Ook van twee andere kinderen van Hendrik was zij misschien de moeder, Willem en Rohese, hoewel de laatste volgens sommige bronnen genoemd wordt als dochter van Sybilla en FitzHerbert.

Nest ferch Rhys (c. 1085 – c. 1136) was the daughter of Rhys ap Tewdwr, last King of Deheubarth in Wales, by his wife, Gwladys ferch Rhiwallon ap Cynfyn of Powys. Her family is of the House of Dinefwr. Nest was the wife of Gerald de Windsor (c. 1075 – 1135), Constable of Pembroke Castle and son of the Constable of Windsor Castle in Berkshire, by whom she was the ancestress of the FitzGerald dynasty.

Nest had two younger brothers, Gruffydd ap Rhys and Hywel, and, possibly, an older sister named Marared, as well as several older illegitimate half-brothers and half-sisters. After their father's death in battle in 1093, "the Kingdom of the Britons fell" and was overrun by Normans. Nest's younger brother Gruffydd was spirited into Ireland for safety; their brother Hywel may have been captured by Arnulf de Montgomery, along with their mother, unless, as appears likelier, their mother was captured with Nest; their fate is unknown. Two older brothers, illegitimate sons of Rhys, one of them named Goronwy, were captured and executed.