St Moninna founded the convent of Killevy near the end of the 5th century. It survived as a house for nuns until it was dissolved in 1542. The Vikings from Carlingford Lough plundered it in 923.
The building in the photograph is two churches joined together. The west church (left hand side of photograph) is the only surviving pre-Norman church in County Armagh and one of only six or seven in the whole of Northern Ireland.
A pictorial map of 1609 shows that Killevy once had a round tower but it was blown down by a gale in about 1768.
Labhras O'Ceallach, Captain Redmond O'Hanlon's harper, wrote a lament for it:
'O steeple of Killevy
My grief to have thee down
If the two Redmonds were living
Thy top would not be broken.'