Old Leighlin is a small town in
County Carlow,
Ireland, 3.5 km west of
Leighlinbridge. The site was at one time one of the foremost monastic houses in
Leinster, with 1500
monks in residence. It was the location for a church
synod in AD 630, which decided that the Irish church should follow Roman as opposed to Celtic dating conventions for determining the date of Easter.