sentences: "This passage lends evidence to the belief that the conquest of Brycheiniog was mostly finished by Eastertide 1093 and that the main effect of the battle of Brecon was to open the way to the conquest of Deheubarth.He followed the Usk down to Ystradyw and took it, which incited the bishops of Llandaff to protest because the annexation of Ystradyw removed it from their diocese and brought it into the lordship of Brecon, which was under the episcopal authority of Saint David's.