In 1172 Henry II granted land hereabouts to the Knights Templar; they made nearby Templetown their headquarters and built various churches. The 13th-century structure they built here was later added to by the Knights Hospitaller and the Loftus estate. On the ground to the left of the church, a stone slab bears a Templar seal: a lamb and crucifix. It is on the road south from Duncannon to Hook Head. The ruins are beside the road and you can wander about them.