Background
He was the son of the previous king Domhnall Óg Mac Carthaigh Mór (r 1359–1390/2).
He was the son of the previous king Domhnall Óg Mac Carthaigh Mór (r 1359–1390/2).
His epithet "na Mainistreach" means "of the monastery.".
Mac Carthaigh was among those Irish kings and princes to submit to Richard II of England in his progress of 1394, after which the title King of Desmond was rarely used by later members of the dynasty, the title of Mac Carthaigh Mór (Prince of Desmond) becoming the preferred.