Thomas D'Arcy McGee

Nial IV. (surnamed Black-Knee) succeeded his father-in-law, Flan of the Shannon (A.D. 916), and in the third year of his reign fell in an assault on Dublin; Donogh II., son of Flan Siona, reigned for twenty-five years; Congal III. succeeded, and was slain in an ambush by the Dublin Danes, in the twelfth year of his reign (A.D. 956); Donald IV., in the twenty-fourth year of his reign, died at Armagh, (A.D. 979); which four reigns bring us to the period of the accession of Malachy II.