On the eastward side of the castle demesne, directly between the River Boyne and the village's Church of Ireland church in Slane, lay the ruins of St. Erc's Hermitage, a 15th-century multi-storey chapel, and with some 500 metres westward of St. Erc's Hermitage an ancient well can also be found. In one of the central texts of Irish mythology, the "", this well is said to have been blessed by the God so that the could bathe in it and be healed, allegedly healing all mortal wounds except decapitation. However, with the arrival of Christianity in Ireland, and the policy of Christian reinterpretation for traditionally pagan sites, the well is now more commonly referred to as "Our Lady's Well."