919 - Vikings ruled in York again



Britanny

A Norwegian Viking chief named Ragnvald raided the Loire area and attacked Nantes. Count Fulk I of Anjou who claimed the title of Count of Nantes, lost to the viking raiders.
England
Edward the Elder build a fortress at Bedford
Ireland
October – The king of Ireland Niall Glúndub was killed while fighting against the vikings at the Battle of Kilmashoge. Tír Conaill and Armagh was raided.