I was very interested in this information. It brings up such a coincidence. Before I tell you and others about this, I want to make it clear that the unusual source of my story is not meant to diminish the value of your words.
We have in our Sunday comics section a comic strip called Prince Valiant. It is probably one of the longest running ones--maybe over 50 years. It is not a "comic" story but beautifully drawn and tells the mythical story of Prince Valiant who lived during King Arthur's time. Over the years it has been evident that the author of this strip has researched the customs and history of that era and brings a greater understanding of the art of defensive and offensive warfare as well.
The Prince is married to the Queen of some northern islands. The present story started two weeks ago. It told of this villainous and most powerful merchant that brought salt northward to trade and then filled his ship with ice that the people of Thule (my dictionary says "northernmost regions of ancient world, possibly Norway, Iceland, Jutland, etc. or Eskimo settlement on the NW coast of Greenland) provided. The pictures showed Europeans hacking chunks off of glaciers and the merchant gathering them from the fiords. This ice then would be taken south to trade.
Last week the villainous merchant cut off the supply of salt to this country. They thought they could get along with wise stringent use of their salt but now the fishing industry is so endangered from the lack of salt that it seems the villain is about to achieve his hidden agenda.