Ailill Molt was son of Nath-Í, that king of Ireland who died somewhere on the Continent, whither he had led an expedition in 429, and whose body was brought back to Ireland by his men and buried at Cruachain in the ancient cemetery of the kings of Connacht. Nath-Í, who succeeded Niall of the Nine Hostages, was the son of Niall's brother Fiachra, whose descendants were settled in Fiachra's Lands in the north-west and south-west of Connacht. The line of Fiachra was closely associated with Connacht and had no settlement elsewhere. At this period, the line of Fiachra alternated with the line of his brother Brión in the succession to the kingship of Connacht, until, by the operation of a law of succession which I shall have to describe in a later lecture, the descendants of Brión obtained exclusive possession of the kingship. Thus, Ailill Molt, who was cut off in the battle of Ocha, in 483, may be described as a king of Ireland from Connacht. Who were the victors in the Battle of Ocha? They were Luguid, son of Loeguire, son of Niall, and Muirchertach, grandson of Eoghan, son of Niall. Luguid, son of Loeguire, thereupon became king of Ireland. His ally in the battle, Muirchertach, appears from this time forth at the head of the Northern Ui Néill, he is king of Aileach. Luguid, since he succeeded to the monarchy, must have been at the time recognised head of the Southern Ui Néill, his patrimony being in Meath. Consequently, this battle is the outcome of a combination of the Ui Néill, north and south, whose lands are outside of Connacht, against their kinsfolk, whose lands are in Connacht. From this date, 483, until the eleventh century, no king from Connacht became monarch of Ireland, and the monarchy remained in the exclusive possession of the Northern and Southern Ui Néill. That is why the battle of Ocha is marked as an epoch by the ancient chronicler. The line of Niall in like manner is excluded from the kingship of Connacht, which had been held by Niall himself and by his son Loeguire, before they became kings of Tara. Henceforth there is no longer a joint dynasty of Connacht and Meath.