An Caisleán Nua

An Caisleán Nua, meaning 'the new castle,' originated in the medieval period as a fortified settlement. The barony of Newcastle emerged from the Gaelic túath of Ui Donnchad following the Norman invasion, with the FitzDermot family descending from Dermot Mac Giolla Mocholmog. Archaeological evidence reveals ringforts and fulachta fia scattered across the townlands, indicating early settlement pa...