Fergus mac Róich
When his foster father Fergus mac Róich, now in exile in Medb's court, is sent to face him Cú Chulainn agrees to yield, so long as Fergus agrees to return the favour the next time they meet. Finally, he fights a gruelling three-day duel with his best friend and foster brother, Ferdiad, at a ford that was named "Áth Fhir Diadh" (Ardee, County Louth) after him.