The Kilnasaggart Inscribed Stone, a few hundred metres from the border at the Gap of the North in south Armagh. The following information is from
Link , accessed on 4th Feb 2015:
"'Cill na Saggart' means the 'church of the priest'. Standing at almost 2m tall, Kilnassagart Inscribed Stone is regarded as being one of the oldest inscribed stones in Ireland. It stands on the ancient road which ran from Tara in County Meath and through the Moyry Pass to Dunseverick Head on the North Antrim Coast (Sighe Midhlachra).
It has a total of 13 crosses on its faces and the inscription, ‘This place, bequeathed by Temoc, son of Ceran Bic, under the patronage of Peter, the Apostle.’ Temoc’s death was recorded around 714, which sets the stone in the 8th century. Excavations at the site in 1966 and 1968 revealed an early Christian graveyard with graves oriented radially around the pillar and facing towards the rising sun. It is thought that a church was probably located nearby."