In the Ulster Cycle of Irish mythology, Dubthach Dóeltenga ("beetle-tongue", beetles being proverbially black) was a cynical ally of Fergus mac Róich who rarely had a good word to say about anyone. He followed Fergus into exile in Connacht following the Deirdre affair, and fought beside him in the Táin Bó Cuailnge, although at one point Fergus punched him right out of the camp.
