In the history of the Kingdom of Dublin, the Gaelic Irish recaptured the city from the Norse Vikings after the Battle of Tara. Dublin was officially founded in 988 when the Norse King Glúniairn first recognised Máel Sechnaill mac Domnaill as the High King of Ireland, he also agreed to pay taxes and accept Brehon law. The city celebrated its millennium in 1988 to mark 1000 years from its founding. Even though this event was seen as the first recorded establishment of the city, evidence exists of other settlements on the River Liffey prior to this event, one being Viking known as Dyflin and the other Gaelic Irish known as Átha Cliath (Ford of Hurdles).