The reference to Croesus in King Croesus' Contempt for Death or KCCD is a complicated one which required some research on my part. The best explanation that I could draw from the Wikipedia refers to the fickle nature of one's fortune which is a natural and essential component to any good adventure. Their itinerary is an ambitious one that does a bit more than circumnavigate the globe:
I haven't read through the whole adventure yet but the blog is fantastic. It offers great technical detail, fabulous photography, and superb humor from two of the ballsiest Norsemen around. Check them out here and support their adventure!