Ruaidhri O Conchubhair assumed the sovereignty of Connaught and the greater part of Leath Cuinn, because the king of Oirghiall, the king of Meath and the king of Breithfne submitted to him, and, moreover, he is called king of Ireland in the seanchus. Still he was only a king with opposition, that is, a king to whose possession of the sovereignty of Ireland a great many of the Irish nobles were opposed. And it was while Ruaidhri reigned in this manner that the wife of Tighearnan Caoch O Ruairc (Dearbhforgaill was her name, and she was daughter to Murchadh Mac Floinn, king of Meath, and not wife of the king of Meath as Cambrensis says) sent messengers in secret to Diarmaid Mac Murchadha asking him to come to meet her and take her with him as his wife from Tighearnan; and she told the messengers to make known to Diarmaid that Tighearnan had gone on a pilgrimage to the cave of Patrick's Purgatory, and that, therefore, he would have an opportunity of quietly carrying her with him to Leinster.
There had been indeed an illicit attachment between them for many years previously. As to Diarmaid, when this message reached him he went quickly to meet the lady, accompanied by a detachment of mounted men, and when they reached where she was, he ordered that she be placed on horseback behind a rider, and upon this the woman wept and screamed in pretence, as if Diarmaid were carrying her off by force; and bringing her with him in this manner, he returned to Leinster. As to Tighearnan, when he returned to Breithfne and heard that it was against her consent his wife was taken from him, he made a complaint of this outrage to Ruaidhri O Conchubhair and to his friends in general.
Upon this Ruaidhri made a muster of the men of Connaught, Breithfne, Oirghialla and Meath, and set out with a large host to waste Leinster to avenge this evil deed Diarmaid had done.
When Diarmaid heard that Ruaidhri was marching to waste Leinster, he assembled and brought together the nobles of Leinster from all sides, and when they came to one place their answer to Diarmaid was that they would not go to defend the evil deed he had done, and thereupon many of them deserted him and put themselves under the protection of Ruaidhri, and made known to him that Diarmaid before that time had committed many acts of injustice and tyranny against them.
As Diarmaid was not strong enough to fight Ruaidhri, the latter set about spoiling the territories of all the Leinstermen who sided with Diarmaid; and he went on to Fearna and levelled Diarmaid's house, and broke his fortress, and banished him out of Ireland altogether. And Diarmaid went to Henry II., king of England, who was then in France; and when he had come into the king's presence, the latter welcomed him and showed him much friendship; and when he made known to the king the cause of his visit, the king wrote friendly letters to be taken by him to England, in which he gave permission to all who so wished to go with him to Ireland to help him to recover his own territory. Diarmaid, on this, bade farewell to the king, and proceeding to England arrived at Bristol, and caused his letters to be read there publicly; and he made large promises to those who would go with him to Ireland to recover his own territory.
It was there he met Richard Fitz Gilbert, son of earl Stranguell; and he made a compact with him, to wit, to give his own daughter, that is, Aoife, daughter of Diarmaid, to wife to him, and with her the inheritance of Leinster after his own death, Richard to be obliged to follow him
The prince then released Robert on condition that he would follow Mac Murchadha to Ireland the next summer. Diarmaid, on the other side, promised Robert Fitz Stephen Loch Garman and the two cantreds next it, as his property for ever, in return for his coming to help him to fight his enemy; and after this compact was made, Diarmaid bade farewell to these people and proceeded with only a small force to Ireland. Having landed in a place where he had many enemies and few friends, he went secretly to Fearna Mor Maodhog, putting himself under the protection of the clergy and community of Fearna; and he stayed with them sad and wretched during the time that elapsed until the coming of summer.
As to Robert Fitz Stephen he came to fulfil his promise to Mac Murchadha, and the number of the host that came with him to Ireland was thirty knights, three score esquires and three hundred foot; and the place where they landed was at Cuan an Bhainbh on the south coast of the County
When Diarmaid heard this he rejoiced, and went to meet them with five hundred warriors; and when they had come together they proceeded by agreement to attack Loch Garman with a view to getting possession of it; and when they were approaching the town, the burgesses came to the decision of submitting to Diarmaid, and of giving him four of the nobles of the town as hostages for their maintaining peace and paying him rent and tribute and for their being obedient to him as their lord. It was then that Diarmaid bestowed Loch Garman and the two cantreds next it on Robert Fitz Stephen, and, moreover, he bestowed the two cantreds next again to these on Herimont Morti, according to the promise he had made them in Wales; and after he had fulfilled this promise Diarmaid assembled his own people and the foreigners to one place; and the number of the host that assembled there was three thousand men, counting Gaels and foreigners; and they proceeded thence of one accord to plunder and spoil Osruighe; and the king of Osruighe at that time was Donnchadh, son of Domhnall Reamhar, an inveterate enemy of Diarmaid, and as they had come to waste Osruighe, while Donnchadh could not defend himself, he, with the nobles of his country, decided to give Diarmaid hostages for the payment to him of head rent; and thus Diarmaid was prevented from wasting the country.
Now when the nobles of Ireland heard of the arrival of Diarmaid and of these foreigners and of all the successes
When the Leinster clergy saw that the country was in danger of being thrown into disorder and destroyed by this conflict, they did their best to bring about peace between Ruaidhri and Diarmaid; and these were the terms in which this peace was concluded, to wit, Diarmaid to have the province of Leinster which he had inherited, and to be obliged to be obedient and faithful to Ruaidhri, as every king of Leinster was bound to be to the kings of Ireland, and in pledge for the fulfilling of the terms of this peace Diarmaid gave one of his sons named Art to Ruaidhri as a hostage. Moreover Ruaidhri promised to give his own sister to Diarmaid to wife; and on these terms they