Unofficial guide. Not the National Monuments Service, the OPW, Fáilte Ireland or the landowner. Disclaimer
At a glance
- TypeChurch
- Date or period mentioned17th century
- Condition (as surveyed)Gone: no visible trace
What to look for
- Graveyard
- Cross-slab
Picked out from the Archaeological Survey description below.
Can you visit?
- No source says it is open to the public.Most monuments in Ireland stand on private farmland.
- Ask the landowner before crossing fields, close gates, leave the stones as you find them.Visiting responsibly
History and description
Church of Ireland church ruins at Ballyboy possibly situated on site of medieval church and graveyard (OF031-044001-), with possible early christian cross-inscribed slab (OF031-044002-) inside graveyard. Medieval church depicted on 17th century map of Ballyboy.
Full archaeological record 82 words
Church of Ireland church ruins at Ballyboy possibly situated on site of medieval church and graveyard (OF031-044001-), with possible early christian cross-inscribed slab (OF031-044002-) inside graveyard. Medieval church depicted on 17th century map of Ballyboy. Motte and bailey castle (OF031-015001/002-) to N of church. Presence of early-christian cross-slab confirms local tradition that this church has its origins in the Early Christian period. According to local tradition this church was founded by St Bridget. (O'Flanagan 1927 vol. 2, 104-5) Duplicate entry with OF031-067001-.
Archaeological Survey of Ireland, National Monuments Service (CC BY 4.0) · Updated 15 September 2010 · Based on the Archaeological Inventory of County Offaly. It describes the site as it was when surveyed.
Folklore and traditions
Presence of early-christian cross-slab confirms local tradition that this church has its origins in the Early Christian period.
According to local tradition this church was founded by St Bridget.
More ancient churches nearby

Gallen Monastery
Church · Gallen · Offaly · 13 km away
St Carthach's Church
Church · Rahan Demesne · Offaly · 13 km away
Saint Manchan's Church
Church · Lemanaghan · Offaly · 14 km away
Tisaran Church
Church · Moystown Demesne · Offaly · 18 km away
National MonumentRoscrea Church
Church · Townparks (Roscrea Par.) · Tipperary · 25 km away
National MonumentNuns' Chapel
Church · Clonmacnoise · Offaly · 25 km away
Visitors' notes
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Around St Mary's Church
Other heritage nearby
- Lady's WellHoly well · 4.4 km
Recorded within 5 km
- 18 ringfortsArchaeological Survey of Ireland
- 6 castlesArchaeological Survey of Ireland
- 3 holy wellsArchaeological Survey of Ireland
- 1 abbey or friaryArchaeological Survey of Ireland
- 1 standing stoneArchaeological Survey of Ireland
- 1 ancient churchArchaeological Survey of Ireland
Walks and trails
- Offaly WayLong Distance Waymarked Way · 40.5 km · nearest point 1.2 km
- Birr Cycle Hub Loop 3 BRoad Cycling Trail · 44.3 km · nearest point 1.7 km
- Birr Cycle Hub Loop 3Road Cycling Trail · 73.2 km · nearest point 2.4 km
Outdoors, towns and places to stay
- Knockbarron WoodForests · 6.8 km
- BrittasForests · 11 km
- Slieve Bloom Mountains Nature ReserveNature reserves · 12 km
- Clara Bog Nature ReserveNature reserves · 17 km
- Roundwood HouseHistoric stays · 20 km
What's on nearby
- Apitherapy Seminar - Bee Products for Health & Wellbeing2026-11-14 · 18 km

