• Born: Est 1095, Aberhonwy, Brecon, Wales
• Married: Apr 1121
• Died: After 1143, Gloucestershire, England
• Buried: Llanthony Priory, Gloucester, England

  Research Notes:

A charter dated to [10 Apr/29 May] 1121 records the arrangements for the marriage of "Miloni de Gloec" and "Sibilia filia Beorndi de Novo Mercato", the dowry being all the possessions of her father and of her mother. A manuscript narrating the history of Brecknock priory records that the founder “Bernard de Nefmarche, Norman” married “Neste qe fut apele Agnes, la file Griffin le fiz Lewelin…cruel tyrant de Gales” by whom he fathered “Mael…noble chevalier” whom it was claimed was not his son and who was deprived of Brecknock in favour of “la file [de] Neste, Sibile” wife of “Miles…fiz Watir le conestable de Gloucestre e de Hereford”. The Historia fundationis cum fundatoris genealogia of the priory of Abergavenny names “Sibillam, legitimam hæredem totius terræ Breconiæ…Bernardi et Agnetis de Novo-Mercato” as wife of “Milonem”, son of “Waltero constabulatio totius Angliæ”. “Mylo constabularius de Gloucestria” donated property to Lanthony abbey, naming “antecessores mei Rogerus de Gloecestria et Walterus constabularius”, by charter dated 1137, supplemented by another later donation (undated) jointly with "uxor mea Sibilla et filii mei Rogerus et Walterus atque Henricus". A manuscript in Aske´s collections names “Milo…Erle of Herforde, Lord of Bricone and of all the Forest of Done, and also Constable of England…Sibbill wiff of the seid Milo…” among those buried at Lanthony Priory. ²