He appears to have been a son of Cathrannach mac Cathal , described as of Maenmag in the Annals of Ulster upon his death in 801 .
Fearghal was ruler of Loch Riach in what is now County Galway .
Fearghal appears to have been a son of Cathrannach mac Cathal , described as of Maenmag in the Annals of Ulster upon Fearghal 's death in 801 .
Fearghal was ruler of Loch Riach in what is now County Galway .