History of Dublin

Following Mac Murrough’s death, Strongbow declared himself King of Leinster after gaining control of the city. In response to Strongbow's successful invasion, King Henry II of England reaffirmed his sovereignty by mounting a larger invasion in 1171 and pronouncing himself Lord of Ireland. Around this time, the county of the City of Dublin was established along with certain liberties adjacent to the city proper. This continued down to 1840 when the Barony of Dublin City was separated from the Barony of Dublin. Since 2001, both baronies have been redesignated the City of Dublin.

Dublin Castle, which became the centre of Norman power in Ireland, was founded in 1204 as a major defensive work on the orders of King John of England. Following the appointment of the first Lord Mayor of Dublin in 1229, the city expanded and had a population of 8,000 by the end of the 13th century. Dublin prospered as a trade centre, despite an attempt by King Robert I of Scotland to capture the city in 1317. It remained a relatively small walled medieval town during the 14th century and was under constant threat from the surrounding native clans. In 1348, the Black Death, a lethal plague which had ravaged Europe, took hold in Dublin and killed thousands over the following decade.

Dublin