Whence is the Death of Cet mac Magach? Not hard to tell.
Once upon a time Cet went into Ulster to seek the slaying of a man, a thing he often did (viz., to slay Ulstermen), for from his childhood he never went without the slaughter of an Ulsterman.
So he went westwards, having the heads of thrice nine men of Ulster with him. And Conall Cernach was then sent upon his track to Brefne in Connaught (for winter-snow had fallen), until in an empty house he found him and his charioteer cooking their meal. The horses, however, were under the chariot outside.