816 - Inis Cathaigh was raided

Ireland
Inis Cathaigh was plundered by Danish vikings, they slaughtered the monks, and they defaced the holy monument of St. Senan.
The viking raids continued on Inis Catthaigh (Scattery Island) until the vikings were defeated in 1014 at Clontarf.
Spain
During the 13-day conflict between Emir Al-Hakam and Prince of Pamplona, Inigo Arista. Vikings participated as allies of the Basques. They were probably operating as mercenaries, According to the sources, the chieftain who led the Vikings was called Saltan (Halvdan), and he died in the battle.