Bagenalstown, officially named Muine Bheag, is a small town on the River Barrow in County Carlow, Ireland. In the eight century, Saint Lappan …Bagenalstown, officially named Muine Bheag, is a small town on the River Barrow in County Carlow, Ireland. In the eight century, Saint Lappan reputedly founded a monastic school outside Bagenalstown in the townland of Donore. He is the patron saint of Bagenalstown.