The Vikings first established a base at the mouth of the River Liffey in 841. This was used as trading/pirate base and survived until 902 when the native Irish defeated and exiled the Vikings. Two Viking cemeteries uncovered in the last century are believed to have been connected with this settlement.
By 917 the Vikings had returned and re-established Dublin as an enclosed town with a network of streets, pathways and houses.
Excavations during the period 1961-1981 revealed much information about this town. House sites were identified, evidence of craftworkers was uncovered and details of dress, food and games and pastimes were found. Evidence was also uncovered of extensive trade links between Dublin and the rest of Europe.