クラレンドン法
In 1158 or 1160, Roger advanced with an army to the relief of Carmarthen Castle, then besieged by Rhys, and pitched his camp at Dinweilir. Not daring to attack the Welsh prince, the English army offered peace and retired home. In 1163, Rhys again invaded the conquests of Clare, who, we learn incidentally, has at some earlier period caused Einion, the capturer of Humfrey Castle, to be murdered by domestic treachery. In 1164 he assisted with the Constitutions of Clarendon. From his munificence to the Church and his numerous acts of piety, Roger was called the "Good Earl of Hertford". He was the founder of Little Marcis Nunnery prior to 1163.