Dubthach Dóeltenga

A Red Branch warrior. Dubthach Dóeltenga was the son of Lugaid Mac Casrubae. Dubthach was like Bricriu, another character in the Ulster Cycle, causing troubles and strife because he often reviled other warriors, very much like the Greek soldier Thersites in the Trojan War.

Dubthach appeared in the tale of Deirdre, titled Longes mac nUislenn (The Exile of the Sons of Uisliu), as one of the Red Branch warriors whom Noísi trusted to be his guarantee of safe passage back to Ulster. When Conchobar had Noísi and his brothers treacherously murdered, he joined Fergus Mac Roich in retaliation against Conchobar. Dubthach killed Conchobar's son and grandson, Maine and Fiachna (son of Fedelm). Dubthach also massacred all of the young girls living in Emain Macha, when Fergus set fire to Emain Macha. Dubthach joined Fergus and Cormac Connloinges, along with 3000 of the Ulster warriors in exile, living in the court of Ailill and Medb, rulers of Connacht, Ulster's traditional enemy.

Dubthach also took part in the Cattle Raid of Cuailnge, and the Destruction of Da Derga's Hostel, as one of the warriors of the high king Conaire Mór.