This set a pattern that Dublin was fought for, not fought in. It became the core of the Gaelic kingdom of Leinster, and the Vikings established a large settlement by what is now Dublin castle, until ejected by Brian Boru at the Battle of Clontarf in 1014. Customs House on the Liffey History ĭublin is in a low-lying, fertile area, not boggy by Irish standards, and with good sea access.
