Síol Maelruain was a territory located in north County Roscommon due west, from what is now Castlerea.
A great army of Leth Mogha under Cormac grandson of Carthach and Conchobor ua Briain went into Connachta and cut down the Ruadbeitheach and the Belata and killed Cathal son of Cathal, heir designate of Connachta, and Gilla na Naem ua Flainn, chief of Síl Maílruain.
He reached Roscommon, and the Sil Murray fled before him into the north of Connaught; and the English had no preys to seize upon on that occasion.
Donnell Ó Floinn was slain on the same day, by the son of Robin Lawless, at the upper end of Sruthair.
Simon de Exeter was slain by Brien Ó Floinn and the two sons of O'Flanagan, Dermot and Melaghlin; in consequence of which war and dissensions arose in Connaught.
After this the English committed great depredations; but they restored the whole of the spoils to the family of Trinity Island and the monks of the abbey of Boyle.
Fiachra Ó Floinn, Chief of Síol Maelruain, the most hospitable and expert at arms of all the chiefs of Connaught, went to form an alliance with the English by marriage, but was treacherously slain by the son of Richard Finn Burke, Mac William, and Mac Feorais.
Conor, son of Fiachra Ó Floinn, the most hospitable and valiant youth of his tribe, died.