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Not who you're looking for? Others named Castlereagh: former local government district in Northern Ireland · suburb of Sydney, New South Wales, Australia · barony in County Roscommon, Ireland · former state electoral district of New South Wales, Australi
Castlereagh 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.
