Sibyl de Neufmarché Countess of Hereford suo jure Lady of Brecknock (c. 1100 – after 1143) was a Cambro-Norman noblewoman heiress to one of the most substantial fiefs in the Welsh Marches. The great-granddaughter of Gruffydd ap Llywelyn king of Wales Sibyl was also connected to the nobility of England and Normandy.
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