Feradach Finnfechtnach, son of Crimthann Nia Náir, was a legendary High King of Ireland of the 1st century AD. He was said to have had two bull's horns on his head. Sources disagree on his succession to the kingship. The Annals of the Four Masters says his father, Crimthann, was overthrown by Cairbre Cinnchait, and Feradach went into exile before returning to reclaim the kingdom. Seathrún Céitinn, on the other hand, places Cairbre's revolt later and has Feradach simply succeed his father.
(Wikipedia)