 Gruffydd formed an alliance with Gwynedd, and later in 1136 the sons of Gruffudd ap Cynan, Owain Gwynedd and Cadwaladr ap Gruffydd, led an army to Ceredigion. Their combined forces won a decisive victory over the Normans at the Battle of Crug Mawr. Ceredigion was reclaimed from the Normans, but was annexed by Gwynedd as the senior partner in the alliance. Gruffydd ap Rhys continued his campaign against the Normans in 1137, but died later that year. The leadership of the family now passed to Rhys's half-brother Anarawd ap Gruffydd. In 1143, when Rhys was eleven, Anarawd was murdered by the bodyguard of Cadwaladr ap Gruffydd, brother of Owain Gwynedd, king of Gwynedd. Owain punished Cadwaladr by depriving him of his lands in Ceredigion.
