Coolkerry parish was established in the early 13th century, when it was patronised by the builders of Norman strongholds such as the nearby
Coolkerry Castle. The Norman patrons allocated the tithes of the parish to St Thomas's Abbey in Dublin, a house of the
Canons Regular. The ruins of
Coolkerry Church are in a graveyard near the south-western corner of Coolkerry townland. The church is on a rise overlooking the
River Erkina. Only the remains of the west gable are still standing, with just grassy banks in the place of the remaining walls of the church which was about 17 metres long and 7.3 metres wide. The church has been in ruins since at least the middle of the 17th century, the
Down Survey marking the site as having a "ruined church, weir and cabin". which is believed to have been built by Pipard, a descendant of
Adam de Hereford, the first Norman to colonise this part of County Laois. Both castles were associated with the weir on the River Erkina just by the site of Coolkerry Church. ==References==