 The male line of the ruling Mac Suibhnes soon failed after Eoin, when both his son, Suibne, and his brother, Toirdelbach, died without heirs.Following the Battle of Bannockburn in 1314 Murchad Mear, great-grandson of Máel Muire an Sparáin and grandson of the Murchadh who died while a prisoner of the Earl of Ulster, arrived at Lough Swilly with his followers.Murchad Mear was succeeded by his son, Murchad Óc, as lord of the lands east of Bearnas Mór.