
What is recorded here
Killyon Abbey marks a fifth-century nunnery founded by St. Ciaran of Saiger, later overlaid by a fortified house built by Nicholas Herbert in 1627. What remains is a square bawn, fragmentary corner turrets, gun loops and the grass-covered footings of a long building, all testifying to repeated defence and reuse. The site has lost much of its visible form, but its layers still suggest a place where worship, residence and resistance kept returning to the same ground.
According to O' Flanagan (1933, vol. 2, 19) St. Ciaran of Saiger founded a nunnery at Killiadhuin [Killyon] in the fifth century. According to local tradition the fortified house and bawn built by Nicholas Herbert in 1627 may have been built on site of the nunnery. Today all that remains are the wall footings of what appears to be a large walled area 52m N/S by 52m E/W with the fragmentary remains of a NW circular turret (H 3m; W T 0.8m) and the foundations of a SE turret with adjoining S wall (L 7m; H 3m; wall T 0.8m). Gun loops visible on S wall. Inside this courtyard area to the N are the grass covered wall footings of a long building (12m N-S by 33m E-W) orientated on an E/W axis. Overall this may be the site of a large defended fortified house (OF036-035002-) with bawn wall and circular corner towers. The presence of gun loops for defensive purposes would indicate a late medieval date for the site. Cooke (1875, 178) described the site as having a large square shaped gatehouse which opened onto a courtyard with small round flanking towers with gun loops visible. The remains represent the site of Killyon Manor which according to Cooke (1875, 182) was occupied by a person named Herbert (Harbart) in 1634. Possibly built near the site of 'Killyon Abbey' which as a result was marked on the six inch OS 6-inch map. A datestone (OF031-069----) from this castle was moved from here to the parish hall in the nearby village of Rath. Monument entered into the Register of Historic Monuments on the 16 December 1988.
The above description is derived from the published 'Archaeological Inventory of County Offaly' (Dublin: Stationery Office, 1997). In certain instances the entries have been revised and updated in the light of recent research.
Compiled and revised by: Caimin O'Brien
Date of revised upload: 4 January 2016
St. Ciaran of Saiger is traditionally credited with founding a nunnery at Killyon Abbey in the 5th century, and it later had a fortified house built by Nicholas Herbert in the early 17th century. The site is remembered for its early Christian heritage and its later role in the Anglo-Irish settlement period.
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- What survives
- Recorded monument
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