“A.D. 1236. Felim, the son of Cathal the Red-handed, returned to Connaught after his banishment, being invited thither by some of the Connacians, namely, by O’Kelly, O’Flynn, the son of Hugh, who was son of Cathal the Red-handed O’Conor, and the son of Art O’Melaghlin, all forming four equally strong battalions. They marched to RINN-DUIN, where Brian, the son of Turlogh (O’Conor), Owen O’Heyne, Conor Boy, the son of Turlogh, and Mac Costelloe, had all the cows of the country; and Felim’s people got over the enclosures of the _Island_; and the leaders and subleaders of the army drove off each a proportionate number of the cows, as they found them on the way before them; and they then dispersed, carrying off their booty in different directions, and leaving only, of the four battalions, four horsemen with Felim. As Brian, the son of Turlogh, Owen O’Heyne, and their troops, perceived that Felim’s army was scattered, they set out quickly and vigorously with a small party of horse, and many foot soldiers, to attack Felim and his few horsemen. Conor Boy, the son of Turlogh, came up with the son of Hugh, who was the son of Cathal the Red-handed, and with his party; and mistaking them for his own people, he fell by Roderick, the son of Hugh, who was the son of Cathal the Red-handed. Felim (the king) strained his voice calling loudly after his army, and ordering them to return to oppose their enemies. Many of the host were killed by Felim upon the island; and outside the island were slain many _bad subjects_, and perpetrators of evil, as they all were, excepting only Teige, son of Cormac, who was son of Tomaltagh M’Dermott.” Our records are too scanty to enable us to trace the history of this castle and its various possessors with any clearness or consecutive order. It may, however, be inferred from the subsequent annals that it fell into the hands of Felim O’Conor after the attack above stated, and also that he kept possession of it till his death in 1264. During this period, though harassed by the De Burgos or Burkes, and still more by factious rivals of his own race, he usually preserved at least the semblance of peace with the English monarch, and had more than once his hereditary patrimony of five cantreds of land in Roscommon secured to him by royal charters. Upon one of those occasions the scene of conference between the representatives of the British monarch and the Connaught king was the Castle of Rinn-duin, as thus stated in the Annals of the Four Masters:-- “A. D. 1256. A lord justice arrived in Ireland from England, and he and Hugh O’Conor (the son of Felim) held a conference at RINN-DUIN, when a peace was established between them, on condition that while the lord justice should retain his office, no part of the province of Connaught should be taken from O’Conor.”