The northern Hy Neill and the Ulaid took no part in the struggle.
Others have surmised that it was abandoned as a regular place of residence long before this, soon after the northern and southern branches of the Hy Neill had consolidated their power at Ailech and in Westmeath.
For the history of the ancient Irish kings of the Hy Neill see: The Book of Leinster, edited with introduction by R.
However, the effects of Brian's revolution were permanent; the prescriptive rights of the Hy Neill were disputed, and from the battle of Clontarf until the coming of the Normans the history of Ireland consisted of a struggle for ascendancy between the O'Brians of Munster, the O'Neills of Ulster and the O'Connors of Connaught.
Being slightly reinforced, he advanced on the 5th of August, and again turned the enemy out of Busherutgunge, but was again obliged by cholera to retreat to Mangalwar; and on receipt of news from Neill that the enemy were assembling at Bithur, he returned to Cawnpore, and abandoned for the time the attempt to relieve Lucknow.
The tanists or heirs of the northern and southern Hy Neill having died, the throne fell to Maelsechlainn II., of the Cland Colrnain, the last of the Hy Neill who was undisputed king of Ireland.
Diarmait MacMurchada (Dermod MacMurrough), greatgrandson of Diarmait Mael-na-mBo, as king of Leinster was by descent and position much mixed up with foreigners, and generally in a state of latent if not open hostility to the high-kings of the Hy Neill and Dalcais dynasties.
Robert Barclay Thomas Rudyard Gawen Lawrie Lord Neill Campbell Andrew Hamilton Edmund Andros.
Through an elder line from Neill Mor was descended Brian Mac Phelim O'Neill, who was treacherously seized in 1573 by the earl of Essex, whom he was hospitably entertaining, and executed together with his wife and brother, some two hundred of his clan being at the same time massacred by the orders of Essex.
He applied to the northern Hy Neill to come to his assistance, and even offered to abdicate in favour of the chief of the Cinel Eogain, but the latter refused unless Maelsechlainn undertook to cede to them half the territory of his own tribe, the Cland Colmain.