The Anglo-Saxons of England were of Germanic descent, but they were not of the Norse Scandinavian Kings who ruled the Danelaw and Kingdom of Jorvik - and in the century AD, the Vikings finally overran Great Britain and established Scandinavian colonies, while wiping out the native Anglo-Saxon and Celtic cultures. Following this POD, the Viking civilization would grow considerably to include Ireland (Hibernia, or Hebernland as the Norse would call it), large tracts of North America and would radically alter the course of medieval, and later modern, history.
OTL vs. ATL
There is no England, nor any Great Britain - the Viking conquest of the British Isles formed several smaller kingdoms. The Norse civilization as a whole spread to large parts of North America as well, creating a Pan-Nordic civilization on both parts of the Atlantic since the beginning of the 2nd Millennium.
France and England thus never engaged in constant warfare, the rise of a powerful English state thus never became a player in the religious politics of Europe, and there are only three major Christian entities - the Catholic Church, the Eastern Orthodox Church and the Nordic Church, which served a schism similar to that of the East-West Schism in 1357.
The Crusades ended in bitter failure for the Europeans, and Spain was never freed from Muslim hands - resulting in the powerful Cordoban Caliphate. The Mongols were held at bay by the Teuton-Norse Alliance, called the Last Alliance, in the War of Lithuania, where the Mongols were finally stopped and defeated by the Europeans. As the Teutons formed their mighty Lithuanian Empire on the continent, the Vikings continued their expansive network of trading kingdoms in Scandinavia, the North Sea, and the North American coast.
Conflict would continue with time, as the race to the new world began. The Nordic kingdoms had a vested interest in protecting their allies in what Catholic Europeans romantically called "Atlantis," but the Vikings merely knew by the far-flung colonies that had grown into powerful local countries over time. Wars between the Cordobans, French, Norse and Germans in Atlantis would define the global sphere for years to come.
In this Timeline, the Vikings were also the first Europeans to reach Japan, sailing from their North Atlantean colonies through the Bering Sea. The Japanese ambitiously set out to colonize North Atlantis and expand influence there. They allowed the Norse a nominal trading post at Nagasaki, which soon flourished into a fully-Norse city, and the exploration of Asia continued from there, as these Norse were cut off from home.