Aggressive king of Fernmag[Farney] in several early Irish stories. He is best remembered as the killer of Noíse in Longas mac nUislenn[The Exile of the Sons of Uisnech], the Deirdre story. Although Eógan has long quarrelled with Deirdre's adversary Conchobar, he makes peace with the Ulster king and agrees to carry out his treachery. Eógan initially pretends to welcome Noíse back to Ireland, but his greeting includes a mortal spear-thrust. In an alternate version the Norse prince Maine is the killer. Later, when Deirdre admits that she hates Eógan equally with Conchobar, she is sent off in Eógan's chariot; from it she jumps, dashing her head against a stone. In Scéla Mucce meic Da Thó[The Story of Mac Dathó's Pig], Eógan mac Durthacht contests the right of the hero's portion. His family members include father Durthacht (also Darthacht), wife Findige, and daughter Lendabair, the wife of Conall Cernach.