24Westropp, Thomas J. “Slane in Bregia, County Meath: Its Friary and Hermitage.” The Journal of the Royal Society of Antiquaries of Ireland, Fifth Series, Vol. 31, No. 4, (Dec. 31, 1901): 406.
In the 12th century tale, The Banquet of Dun na n-Gedh, St. Erc has a role: "...a wonder-working saint of God's people dwells here, namely, Bishop Erc, of Slaine,• and his custom is to remain immersed in the Boinn, up to his two arm-pits, from morning till evening, having his Psalter before him on the strand, constantly engaged in prayer; and his dinner every evening on returning hither is an egg and a half, and three sprigs of the cresse of the Boinn..." This text is available here.