I think there are sufficient evidence for an AH autor to simply state "I am assuming that the hypothesis of 1142 as the date for the founding of the league is correct" Or 1000, or what have you. If he needs it.
One of the pieces of evidence for an earlier founding was adding up the tenures of all the chairpersons recorded in oral tradition, which gave a date of 1090.
In any case, I think there are two paths to take on Norse settlement of Vinland.
First, OTL, the Norse was at the end of a very long supply chain. Norway to Iceland to Greenland, each link in the chain involved a large drop in population. At Greenland, there were only a few thousand people to provide a pool of settlers.
If we want significant Norse settlement, we need some reason for a larger numbers of people to come in from Scandinavia.
The second path would need only a small number of Norse settling in, but involves significant tech transfer to the natives.
Longships. Iron. Horses and stirrups.
One of the pieces of evidence for an earlier founding was adding up the tenures of all the chairpersons recorded in oral tradition, which gave a date of 1090.
In any case, I think there are two paths to take on Norse settlement of Vinland.
First, OTL, the Norse was at the end of a very long supply chain. Norway to Iceland to Greenland, each link in the chain involved a large drop in population. At Greenland, there were only a few thousand people to provide a pool of settlers.
If we want significant Norse settlement, we need some reason for a larger numbers of people to come in from Scandinavia.
The second path would need only a small number of Norse settling in, but involves significant tech transfer to the natives.
Longships. Iron. Horses and stirrups.