The Saithne or O'Caseys are descended from Glasradh, the second son of Cormac Gaileng, son of Teige, son of Kian, son of Oilioll Olum, King of Munster, and settled here under the monarch Cormac Mac Airt, in the third century. See O'Flaherty's Ogygia, part iii. c. 69. Giraldus Cambrensis states in his Hibernia Expugnata, lib ii. c. 24, that Philippus Wigorniensis seized on the lands of Ocathesie, to the King's use, though Hugh de Lacy had formerly sold them. 'Inter ipsa igitur operum suorum initialia, terras, quas Hugo de Lacy alienauerat, terram videlic. Ocathesi et alias quam plures ad regiam mensam cum omni solicitudine revocavit.'