Rathdown (County Dublin barony)
Barony in Dublin, Ireland / From Wikipedia, the free encyclopedia
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Rathdown (Irish: Ráth an Dúin) is the south-easternmost barony in County Dublin, Ireland.[1][2] It gives its name to the county of Dún Laoghaire–Rathdown. Before County Wicklow was shired in 1606, Rathdown extended further south: it was named after a medieval settlement which grew up around Rathdown Castle, at a site subsequently deserted and now in County Wicklow in the townland of Rathdown Upper, north of Greystones.[3][4] The Wicklow barony of Rathdown corresponds to the portion transferred to the new county; although both divisions were originally classed as "half baronies", in the nineteenth century the distinction between a barony and a half barony was obsolete.