 They invaded the ancient Welsh county of Radnorshire, which is now Powys, and sacked the kingdom of Cynllibiwg.This territory was known as Rhwng Gwy a Hafren, located between the Rivers Wye and Severn.They founded the castles of "Dinieithon", near present Llandrindod Wells, and "Cymaron" in Maelienydd, located between Llanbister and Llangunllo.