Conor na Siudane Ua Briain
On his death in 1268 he was succeeded by his son Brian Ruadh Ó Briain . His eldest son Tadhg Cael Uisce had pre-deceased him in 1259 . A feud which was fostered by the Norman de Clares emerged between the descendants of Tadhg ( Clann Tadhg ) and Brian ( Clann Briain ) over the kingship of Thomond and lasted until the 14th century with the senior Clann Tadhg eventually being victorious . 
<triplet> Tadhg Cael Uisce <subj> 1259 <obj> date of death