The letters and Charters of Gilbert Foliot, abbot of Gloucester (1139-48), Bishop of Hereford (1148-63) and London (1163-87) - Gilberto Foliot ca. 1110-1188; Morey, Adrian (O.S.B.) n. 1904; Brooke, Z. N. 1883-1946 (Cambridge At the University Press, 1967)