Sources: A. Roots 255; Norr; Kraentzler 1109, 1148; Ayers, 324, 852, 887, 888. Roots: Sybil de Ewyas, marriage to Robert I de Tregoz was possibly in 1198. Norr: Sybil de Ewyas, born about 1178, died 1236. Married Robert Tregoz about 1198 (or as early as 1184). She married (2) Roger Clifford about 1217. Eventual heiress of Robert ap Harold. K: Sibylle de Ewyas, born about 1165, Ewyas, Herefordshire. Died before 1236. Ayers: Sibilla de Ewyas, daughter of Robert de Ewyas and widow of Sir Robert Tregoz(e). She was dead in 1236. Married Roger de Clifford in 1214.