“For that matter, during the medieval warming period the Scandinavian population blew up pretty well and a similar lack of inheritable land led to the Viking expansion into eastern Europe, the British Isles, Normandy, Sicily, Iceland, Greenland, and (for a 100-150 years) North America.”
“Sicily”
Most don’t have any idea that the Vikings had a presence in Sicily, a little bit of ancestor of Mafia/GodFather.
I think their capital is near or under the modern two of Fugettaboutit.
I think there’s an historical marker in English (and other languages) at the tomb of Hrolf the Ganger (as it appears today, all fancied up) noting a medieval inscription which cites his descendants’ rule over England, Sicily, probably France, other places. This ain’t it, but is interesting anyway.
https://www.findagrave.com/memorial/8195891/rollo-rognvaldsson
Well, I’m way off the road now, but here’s a page on the two Rogers.
https://www.britannica.com/biography/Roger-I