In 865 a 'Great Army' of Danish Vikings invaded England. There were fierce battles for several years. In the end the Vikings conquered all of northern, central and eastern England, and seized much of the land for their own farms. This area was called 'The Danelaw'.
During the same period, Norwegian Vikings sailed to northern and western Scotland, and seized land for their farms around the coast and islands. They also settled in the Isle of Man, and parts of Wales