It was mentioned at the 1111 Synod of Ráth Breasail which established the diocese boundaries of Munster.

The see of Luimneach, the Maoilchearn eastward, Ath ar Choinne, Lodan and Loch Gair, and the Laitheach Mhor from Aine westward, and Ard Padraig to the south and Bealach Feabhradh and Tulach Leis, the Feil westward and Tairbeart and Cuinche in Thomond, and Crossa in Sliabh Uidhe an Riogh and the Dubhabhann.

Whoever shall go against these boundaries goes against the Lord and Peter the Apostle and St. Patrick and his comhorba and the Christian Church.

The incised cross is remarkably similar to an illustration in the Book of Lindisfarne.

The Ardagh Chalice, discovered just fifteen miles northwest of Tullylease, also shares Lindisfarne stylization.