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 pronounced himself Lord of Ireland.
Since 2001, both baronies have been redesignated the City of Dublin.
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.
Founded as a Viking settlement, the Kingdom of Dublin became Ireland's principal city following the Norman invasion.
The city expanded rapidly from the 17th century and was briefly the second largest city in the British Empire before the Acts of Union in 1800.
Determined to make Dublin a Protestant city, Queen Elizabeth I of England established Trinity College in 1592 as a solely Protestant university and ordered that the Catholic St.Beginning in the 9th and 10th century, there were two settlements which later became the modern Dublin.The subsequent Scandinavian settlement centred on the River Poddle, a tributary of the Liffey in an area now known as Wood Quay.There are other towns of the same name, such as Àth Cliath in East Ayrshire, Scotland, which is Anglicised as Hurlford.The area of Dublin Bay has been inhabited by humans since prehistoric times, but the writings of Ptolemy (the Greco-Roman astronomer and cartographer) in about 140 AD provide possibly the earliest reference to a settlement there.