MABEL [Matilda or Sibylle] (-[29 Sep] 1157). The Chronica de Fundatoribus et Fundatione of Tewkesbury Abbey names (in order) "Mabiliam, Hawysiam, Ceciliam, Amisiam" as the four daughters of "Robertum filium Haymonis, dominum de Astramervilla in Normannia", recording that Mabile married Robert Fitzroy[1497]. Her marriage is recorded by Orderic Vitalis, who also names her parents[1498]. Robert of Torigny records that "filia Roberti Belismensis" was the mother of "Rogerius Wigornensis episcopus", son of "Robertus comes Gloecestrensis…filius primi Henrici regis Anglorum", clarifying that the bishop's grandfather was "Robertus filius Haimonis dominus de Torigneio"[1499]. The Annals of Tewkesbury record that "Mabilia comitissa Gloucestriæ" died in 1157[1500]. m (before [1112]) ROBERT Fitzroy, illegitimate son of HENRY I King of England & his mistress --- ([1090]-Bristol 31 Oct 1147, bur Priory of St James, Bristol). He was created Earl of Gloucester in [Jun/Sep] 1122.
http://fmg.ac/Projects/MedLands/ENGLISH%20NOBILITY%20MEDIEVAL.htm#_Toc254344927