▁forces ▁in ▁battle ▁and ▁O w ain ▁and ▁his ▁brothers ▁Cad wall on ▁and ▁later ▁Cad wal adr ▁led ▁the ▁forces ▁of ▁G w yn ed d ▁against ▁the ▁Norm ans ▁and ▁against ▁other ▁Wel sh ▁princes ▁with ▁great ▁success . ▁His ▁elder ▁brother ▁Cad wall on ▁was ▁killed ▁in ▁a ▁battle ▁against ▁the ▁forces ▁of ▁Pow ys ▁in ▁ 1 1 3 2 , ▁leaving ▁O w ain ▁as ▁his ▁father ' s ▁he ir . ▁O w ain ▁and ▁Cad wal adr , ▁in ▁al liance ▁with ▁Gru ff y dd ▁ap ▁Rh ys ▁of ▁De he ub arth , ▁won ▁a ▁major ▁victory ▁over ▁the ▁Norm ans ▁at ▁C rug ▁M aw r ▁near ▁Card igan ▁in ▁ 1 1 3 6 ▁and ▁an nex ed ▁Cer ed ig ion ▁to ▁their ▁father ' s ▁real m . ▁ ▁Acc ession ▁to ▁the ▁throne ▁and ▁early ▁campaign s ▁On ▁Gru ff y dd ' s ▁death ▁in ▁ 1 1 3 7 , ▁therefore , ▁O w ain ▁inherited ▁a ▁portion ▁of ▁a ▁well - est ab lished ▁kingdom , ▁but ▁had ▁to ▁share ▁it ▁with ▁Cad wal adr . ▁In ▁ 1 1 4 3 ▁Cad wal adr ▁was ▁imp licated ▁in ▁the ▁murder ▁of ▁An ar aw d ▁ap ▁Gru ff y dd ▁of ▁De he ub arth , ▁and ▁O w ain ▁respond ed ▁by ▁sending ▁his ▁son ▁H yw el ▁ab ▁O w ain ▁G w yn ed d ▁to ▁strip ▁him ▁of ▁his ▁lands ▁in