Clontarf
From Tardis Wiki, the free Doctor Who reference
Clontarf was located in Dublin, Ireland.
In 1014, a battle was fought there between the forces of King Sitric Silkbeard of Dublin and King Brian Boru of Munster.
Consequently, in 1006, the Eighth Doctor advised Brother Bernard to stay away from Clontarf in 1014. (AUDIO: The Book of Kells)
