An inland town on Ptolemy's map of Ireland of 100 AD may be Rheban on the Barrow river, the only written records from pre-Christian County Kildare. The estimated date for the abandonment of the sacred pre-Christian site of Knockaulin/ Dún Áilinne is 400 AD, the traditional date for foundation of the monastery at Cill Dara is 490 AD, the date for the death of first Bishop Conlaed ua hEimri, (St Conleth) is 520 AD and the estimated date for the death of foundress St Brigid (Irish: Naomh Bríd), is 524 AD (also dated 521 and 526). Her death has been celebrated traditionally on 1 February, which is also the pre-Christian festival of Imbolc. The rise of Kildare sept the Uí Dúnlainge after 633AD helped promote the cult of St Brigid, as she was related to that dynasty, giving her status as one of three 'national saints' of Ireland and increase the status of the two monasteries where they had influence, Kildare and Glendalough.
