placenamesCastlereagh
An Caisleán Riabhach
The old village in the hills above Belfast brings together the story of Conn O’Neill and a conspicuous nineteenth-century Presbyterian church.
The name
These Irish name elements are associated with this record in the Logainm glossary.
An element’s translation is a clue, rather than a complete explanation of the name. Its form and meaning depend on local history and the full Irish name.
Recorded forms
- An Caisleán Riabhach · Irish · main form
- Castlereagh · English · main form
Place & story
Conn O’Neill at the Grey Castle
Conn O’Neill, the Gaelic lord who died in 1619, resided at Castlereagh’s Grey Castle. Lisburn Museum’s account links his imprisonment at Carrickfergus with the intervention of Hugh Montgomery, who helped secure his escape in return for land. Much of O’Neill’s remaining territory was subsequently sold to private planters. The castle’s association with these transactions places Castlereagh within the early seventeenth-century redistribution of land in County Down, when O’Neill’s lordship gave way to new estates and settlements. [2]
A congregation united in 1720
The historic buildings survey traces the Presbyterian congregation to at least 1652. Its members originally worshipped in separate groups at Knock and Breda, then came together to erect a church here in 1720. A schoolhouse was built in 1826 and later converted into a church hall in 1939. As Belfast grew, the earlier church became too small, leading to the construction of a larger building in 1834–35. The site thus preserves the history of worship, schooling and a changing population across several generations. [3]
John Millar’s church above Belfast
The present Presbyterian church opened on 16 August 1835, designed by John Millar in the Greek Revival style. Its Ionic entrance and circular belfry make a distinctive composition on the elevated site. The interior retains box pews, while original gates, railings and gate piers contribute to the setting. The government survey identifies the belfry as apparently the first of its type on an Irish Presbyterian church. Mature trees and the adjoining cemetery frame a building intended to be seen from the surrounding district. [3]
Geographic information
Sources & further reading
- Logainm.ie — Castlereagh. Place names and geographic record, licensed under CC BY 4.0.
- Forgotten early history of Castlereagh: Conn O’Neill · Irish Linen Centre and Lisburn Museum
- Castlereagh Presbyterian Church, HB25/13/002 · Historic Environment Division, Department for Communities
Name record retrieved 2026-10-25 · Source record modified 2026-09-19. How this page was prepared.