An early Irish saga text presumed to have been in existence but now lost. The title is known from list A of the medieval Irish tale lists. The name of Fiamain is known from other texts as that of a Munsterman, Fiamain mac Forói in full, who was slain in a battle or attack that took place in or near Dún Binni. Similar titles in the tale lists may refer to the same saga, or a related episode: Forbais Dúin Binne (list A), Orgain Dúin Binne (list B), Echtra Fiamain (A) and Aithed Mugaine re Fiamain (A).
Story about the death of Medb’s cowherd Lóthar, with an additional anecdote about the search for the bull (tarb). It occurs only in the first recension of TBC.