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Castlereagh An Caisleán Riabhach(Irish) |
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Location of Castlereagh, County Down, in present-day Northern Ireland. |
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| Sovereign state | United Kingdom |
| Country | Northern Ireland |
| County | Down |
Castlereagh (from Irish: An Caisleán Riabhach, meaning "the grey castle",) is the name of a former barony in County Down, present-day Northern Ireland. It spanned the north-eastern area of the county bordering the baronies of: Ards to the east; Belfast to the north; Iveagh to the west south; and Dufferin, Kinelarty, and Lecale to the south. By 1841 the barony was divided into Castlereagh Lower and Castlereagh Upper.