"About eight miles from the Four Masters’ School in Byrne’s mountain on the old foot-road across Croney to Lough Derg is a Holy Well called [Sliab Dub ?]. ( ½ ml. from the Donegal-Tyrone border)
Local tradition says that as Saint Patrick was going…
"St. Patrick’s Well at Tullaghan has a legend. St Patrick stopped the night in a house near a mountain. The woman told him not to look at the light on the mountain, but he went up and saw a serpent and when he struck it, St. Patrick’s Well sprang up.…