1005 Brian Boru established a fleet

Viking ship 11th century
Hunger in England made the Danish fleet sail home.

The Irish high king Brian Boru established a fleet composed of vikings from Dublin, Waterford, Wexford and Munster to "levy royal tribute" (plunder) in Wales. The revenue from this raid was to be divided in 3 parts, with a third going to the King of Dublin, another third going to the warriors of Leinster and Munster, and the remainder to professors of sciences and arts and the needful. This may have been a tactic Brian Boru used to avoid civil war.