10Zucchelli, Christine. Stones of Adoration Sacred Stones and Mystic Megaliths of Ireland. Doughcloyne, Wilton, Cork: Collins, 2007. 144.
The author quotes George Petrie, who suggested that "early missionaries and clerics carried consecrated stones on their journey, and placed them on altars when celebrating Mass. He refers to a passage in the Book of Lecan regarding St. Aire, 'who left no heirs but mass stones' when he died in 737 AD."