クー・フーリン
Eight years later, Connla, Cú Chulainn's son by Aífe, comes to Ireland in search of his father, but Cú Chulainn takes him as an intruder and kills him when he refuses to identify himself. Connla does not identify himself, as his mother Aífe bound him to not identify himself or back down from a challenge. She does this as she wishes revenge upon Cú Chulainn for loving another woman after her. Connla was also trained and almost beat his father in battle, but misses his spear shot on purpose as he finds out Cú Chulainn is his father. However Cú Chulainn hits Connla with his spear, the Gae Bulg, which mortally wounds him. Connla's last words to his father as he dies are that they would have "carried the flag of Ulster to the gates of Rome and beyond", leaving Cú Chulainn grief-stricken. The story of Cú Chulainn and Connla shows a striking similarity to the legend of Persian hero Rostam who also kills his son Sohrab. Rostam and Cú Chulainn share several other characteristics, including killing a ferocious beast at a very young age, their near invincibility in battle, and the manner of their deaths. Another similar myth is found in the Hildebrandslied, in which Hildebrand kills his son, Hadubrand.