In Tullylease, a village found 30 minutes southwest of Charleville, people can find the site of a monastery thought to have been founded by St. Berechert in the 7th century. Subsequently, in the 12th century, it housed an Augustinian monastery.

The present ruins date from various periods. Part of the east wall is from the 12th century, while the chancel dates back to the 15th century. There is also an 8th-century inscribed stone, or cross slab, dedicated to St. Berechert.