Wiki information Reachtghal:

Crimhthann mac Reachtghal

Crimhthann mac Reachtghal was Abbot of Clonfert, Ireland. He is very uncertainly associated with Crimthann the Warlike, who defeated the Delbhna Nuadat at the battle of Bealach Cro in 751, during the reign of King Aedh Ailghin of Uí Maine, died 767.