In the Middle Ages ownership of the parish of Llantilio Crossenny was divided between the King and the Bishops of Llandaff, Llantelyo regis being the lands owned by the king and Llantelyo episcopi being those owned by the bishops.
By the reign of Henry VI, the manor had been leased to William ap Thomas[REF] who had purchased the manor of Raglan in 1432 and begun the great expansion of the castle.