He was a noted Fianna leader and drowned at Cionn Trá (Ventry) in County Kerry.
A lament was composed by the fairy-queen Creidhe after the drowning of her lover at Cionn Trá, County Kerry.
The drowning of the warrior of loch dá chonn, that is what the wave impinging on the strand laments.
Seeing that the same hath drowned a comely noble man, to me it is an affliction that ever Cael sought to encounter it.
Since now Crimthann’s son is drowned, one that I may love after him there is not in being; many a chief is fallen by his hand, and in the battle his shield ne’er uttered outcry!"