Fergus mac Róich
Fergus mac Róich (son of "Ró-ech" or "great horse"; also mac Róig, mac Rossa) is a character of the Ulster Cycle of Irish mythology. Formerly the king of Ulster, he is tricked out of the kingship and betrayed by Conchobar mac Nessa, and becomes the ally and lover of Conchobar's enemy queen Medb of Connacht, and joins her expedition against Ulster in the "Táin Bó Cúailnge". The name "Fergus" (later Irish "Fearghus") means "man-strength" or "virility", and Fergus is described as being of enormous size and sexual potency. This leads him into many a precarious situation as in the story of the Táin Bó Flidhais.