The area of Cratloe is first mentioned in the Annals of the Four Masters, where it is recorded that in 376 AD, Crimthann mac Fidaig, King of Munster and High King of Ireland died in the Cratloe area from poison administered by his sister, Mongfind, who wished for her son Brión mac Echach Muigmedóin to be High King. Mongfind herself also died later, as she drank the poison to convince the king to take some. In the end, however, Brian had to settle for the Kingdom of Connaught, while the High Kingship went to his half-brother, who was later known as Niall of the Nine Hostages.