Cú Chulainn
When Cú Chulainn returns to Ireland he leaves Aífe pregnant. He gives her a gold ring to give to the child, and instructs her that when he is seven he is to come to Ireland in search of him, but he must not identify himself to anyone. The story is taken up again in "Aided Óenfhir Aífe", when the boy, Connla by name, comes to Ireland as Cú Chulainn had instructed, and his precocious prowess alarms the Ulaid. Because he will not identify himself, Cú Chulainn fights and kills him. When it was too late Cú Chulainn recognised the ring; he had killed his only son.