What is the largest possible Norway?
don't forget England, the POD there being that Hardrada succeeds in taking the throne
Norway+Sweden+Denmark+Finland+Lithuania+Latvia+Estonia+NW Russia with it's outpost trading city of Moscow built by the Vikings and control of the Volga River to the edge of the Byzantine Empire as it's classic trade route so additional cities and towns along it. Add in retention of Ireland, Scotland, and England. Iceland and Greenland. Labrador, Nova Scotia, Newfoundland, the St. Lawrence River Valley and some of the Great Lakes shorelines as well as ports and communities along the New England and Mid-Atlantic states. Normandy in France and maybe some of the Baltic Sea coast communities in Northern Germany and Poland. That'd basically be Viking era colonizations lasting beyond a few hundred years and growing further as communities, emigration destinations, natural population increase, and a vast trading network (we call it transitory when it lasted much longer than most modern states have so far.)
It was united by Harald Hårfager over a thousand years ago, and it was merged with Denmark for centuries (firehundreårsnatta), not Sweden (except for the 1814 union).I did take the original question/challenge as more about Norwegians/Norsemen than Norway as a country since it's relatively new as a unified political entity and of course was merged with Sweden for centuries too.
Expansion North-eastward into Kola Lapland, Bjarmland, the North Dvina and the Pechora at Novgorod's expense during the 1000s-1200s. would be the way to accomplish this. Norwegians reach the Ob River by 1550 and occupy Ugria. Then across to Evekia and Yakutia, perhaps all the way to the Pacific instead of the Russians.
Expansion North-eastward into Kola Lapland, Bjarmland, the North Dvina and the Pechora at Novgorod's expense during the 1000s-1200s. would be the way to accomplish this. Norwegians reach the Ob River by 1550 and occupy Ugria. Then across to Evekia and Yakutia, perhaps all the way to the Pacific instead of the Russians.
Agreed Falecius, sticking together and being governable like the farflung British, Spanish, Dutch, Portuguese, Roman, Mongol, or other empires would take remarkable luck although the Vikings had some (later proven) mechanisms in legal and parliamentary systems and beliefs that proved quite robust when adopted in part by the British and Americans (Common Law, Jury by Peers instead of a Lord, Due Process of Law/Rule of Law ("Law" is a Norwegian word), Private Property Rights/Man's Home is His Castle, Payment of Damages for Personal Injury, etc.) and a focus on trading and production with very diverse peoples like the Romans, Chinese, and British empires (and unlike the Spanish, Mohammedians, etc.) so it could have worked or been no more unlikely than any OTL empire (and a focus on water-based transportation would be an advantage like the Portuguese, Dutch, and English had.)
Where the capital of the empire would be is a good question and Copenhagen, Oslo, Edinburgh, Dublin could make as much sense as London but empires rarely have a capital in what would make the most sense at it's peak of expansion, it's more where they started from or where they were headquartered at the start of major expansion. Moving the U.S. capital to Kansas City or St. Louis or Chicago as a more central point would have made sense by a century ago but they just got major regional federal facilities which is probably what would happen with London, Konigsberg, Hamburg, Vilnius, Moscow, Helsinki, Dublin, Quebec, Boston, Portland, etc. as any place with a great natural harbor, with major rivers accessible from it would develop sizable Norse settlements over the centuries just like OTL.
I did take the original question/challenge as more about Norwegians/Norsemen than Norway as a country since it's relatively new as a unified political entity and of course was merged with Sweden for centuries too.