Keats-Rohan states, [1]
de Monemue, Wihenoc
Son of Caradoc de La Boussac, near Dol, Ille-et-Vilaine, in Brittany. J. G. Evans ed., The Text of the Book of Llan Dav reproduced from the Gwysaney Manuscript, (Old Welsh Texts iv, Oxford 1893, reprinted Aberystwyth 1980), 277-78, relates that Monmouth castle was built in the early Norman period and half of it given to three Normans. After the revolt of Earl Roger in 1075, the castle was given to Wihenoc. Wihenoc built Monmouth priory as a cell of Saint-Florent-de-Saumur sometime afterward and became a monk there, together with his brother Baderon. The castle then passed to Ranulf de Colville, a Norman, before going to William son of Wihenoc's brother Baderon by 1086. Not part of the original Breton settlement, associated with Count Alan from 1066 onward, but probably recruited c. 1076 by Robert, count of Mortain (Keats-Rohan, Domesday People I, 55-56). H. Guillotel, 'Une famille bretonne aux services du Conquérant: les Baderon', Droit privé et institutions régionales: Etudes historiques offertes à Jean Yver (1976), 361-66.
Dugdale, Monasticon Anglicanum, IV, p. 596, no. 1
[1] K. S. B. Keats-Rohan, Domesday Descendants, A Prosopography of persons occurring in English documents, 1066-1166: II Pipe Rolls to Cartae Baronum (Boydell Press, 2002), 592.