Dún Laoghaire or Dún Laoire sometimes anglicised as "Dunleary" is a suburban seaside town in County Dublin, Ireland, about twelve kilometres south of Dublin city centre. It is the county town of Dún Laoghaire–Rathdown county and a major port of entry from Great Britain. From 1821 to 1921 it was officially called Kingstown. The town's name derives from Lóegaire mac Néill, a 5th century High King of Ireland, who chose the site as a sea base from which to carry out raids on Britain and Gaul. Dún is an Irish word meaning fort, and traces of fortifications from that period have been found on the coast. Some stone from that fort is preserved in the Maritime Museum.