The earliest Irish land charter to survive is that of the grant in 1157 of land to the Cistercians in Newry, which lay in Uí Echach, by the High King Muirchertach Mac Lochlainn
Notes and References
Book: Moody, TW . Martin, FX . 1967 . The Course of Irish History . The Mercier Press . Cork, Ireland . 120 & 369.