Ah, so let's presume it is our Harry (anyone object to me calling the lad Harry?) then maybe in ten years, maybe less, he may lead colonists across the sea and establish an empire spanning the North Atlantic?
Norwegian colonisation of the north was essentially a russian doll effect.
So a bunch norwegians go to iceland set up a country there, a bunch of icelanders then carry on to greenland and set up three towns there, a bunch of greenlanders then move onto newfoundland and set up a single village.
Everything is one step removed. Newfoundland only has contact with greenland, greenland with only iceland, And Norway no direct contact with anything past iceland.
Now in OTL in the mid 1200s, the norwegian king took control of his kinsmen in iceland and greenland and made ships to and from greenland go directly to norway, skipping out iceland. So greenland became a norwegian outpsot rather an icelandic one.
A more powerful norway who's king has possibly sailed to greenland himself? Might do that earlier.
Not straight away he'll have other problems first. Maintaing control of England, dealing with the welsh and the irish etc. But probably earlier than in OTL.