He worked on the art at Knowth over several summers in the early 1980s and subsequently extended the study throughout the Boyne Valley and then Ireland generally. Clareen is a small parish a few miles from Birr in county Offaly. A well known Early Christian monastic site, known as Seir Kieran after the founding saint, occurs at the heart of the parish. The community decided to build a community development project around the site and in 1996 they enlisted the help of Dr. O'Sullivan. This work will be built upon by further research in 1998.
Organic material survives at the base of the inner ditch.
Dept. of the Environment. Ringditch with a sequence of fills, unburnt and cremated bone. Accompanied by nearby features which like the ringditch provided C14 dates in the centuries preceding c. Approximately 50m from this Iron Age site a medieval corn-drying kiln was unearthed. The kiln was accompanied by an adjacent barn-like structure and some associated ditches in one of which two skeletons occurred.