This page offers a guide on where to locate and how to complete the mystery, A New England, in Rygjafylke.
Follow Hysing on a Tour of “England”
Hysing can be located on a small island northwest of Heillboer. You can get there by using your longship, which you can call either by pressing ‘J’ or holding ’G and choosing Call Longship from the wheel. When you arrive on the island, talk to the old man called Hysing the World-Wise. He will then take you on a tour of the island, which he thinks is England. Follow him around and observe the many wonders of “England”. When you arrive back in one of his huts, he will become mad thinking someone has kidnapped the King. He will then run past “Hadrian’s Wall” to look for the Picts who stole the king.
When you arrive at the camp north of “Hadrian’s Wall”, interact with the strawman. Another man will then appear and tell you that Hysing has gone mad. Eivor then offers to help calm down Hysing. You can either choose to continue to feed into his fantasy or you may tell him to wake from his dream. Both options yield the same results so choose whichever you prefer.