From Song of the Vikings, by Nancy Marie Brown:
They brought home bright-colored cloaks and tunics and hose in the brilliant scarlets and leaf-greens of the alum-fixed dyes that were all the rage in twelfth-century Europe; an ell of scarlet wook sold for six times the equivalent length of undyed gray.
Alum is what is called a mordant (a lovely word that, according the Griffin Dyeworks, comes from the French "to bite"): something that gets dye to actually stick to the fabric. I love the detail because it relates to culture, fashion, and technology, and, of course, status, which depends on all of those.
The "home" here is Iceland. The subtitle of the books is "Snorri and the Making of Norse Myths". It is a biography of Snorri Sturluson, the 13th century literary and political genius who seems to have given form to a lot of what we now accept as the standard Norse myths, even as his political machinations contributed to chaos in Iceland, his murder, and the eventual loss of Iceland's independence and its rule by the King of Norway.
His era, called the "Sturlung Era" after his family, is when family and regional sagas were written down in the form we now know--13th century views of events and personalities in the 10th and 11th. Snorri seems to have written Egil's Saga, one of the longest and best known. A story does not tell itself. It says something about both the teller and the listener. The people of the contentious and threatened Sturlung Era looked back to the Saga Era and tried to understand how they had ended up where they were.
This is all research for the book I'm working on. It is not set in Iceland, but is definitely inspired by it. Brown does mention, among things, that Iceland's climate does not allow honeybees to survive. I definitely have bees in my book (growing out of my story "The Forgotten Taste of Honey"), so there you go: not Iceland.