 Madog's eldest son, Llywelyn, was killed soon after his father's death in 1160, Powys was then shared between Madog's sons Gruffydd Maelor, Owain Fychan and Owain Brogyntyn, his nephew Owain Cyfeiliog and half-brother Iorwerth Goch.Powys was never subsequently reunited, being separated into two parts; Powys Fadog (Lower Powys) and Powys Wenwynwyn (Upper Powys).Madog's death enabled Owain Gwynedd to force the homage of Owain Brogyntyn, Madog's youngest son, and effectively annex part of northern Powys.