 The latter, though the latest of the four, is thought to draw on the oldest traditions when it deals sympathetically with the Osraige.Primarily intended to edify, educate and entertain, it is unclear to what extent they are an accurate representation of events.The martyrologies, notably the "Félire Óengusso", and medieval Irish genealogies identify Ciarán's father as Lugna (also Laighne), a nobleman of the Dál Birn rulers of Osraige, and his mother as Liadán, of the Corcu Loígde.