Ox of Dile (Dil)
The third wonder of Glenn Dallan in Tirowen mentioned in the The Triads of Ireland or the Trecheng Breth Féne is the Ox of Dil. Following the mention of the The Beast of Lettir Dallan which is centred around a lake by the church, of Ox of Dile it is said:
“Its father came out of the same lake, and went upon one of the cows of the landholder who lived near the church, and begot the ox upon her.”
Whether this is enough to imply that The Beast of Lettir Dallan is its father I am unsure.