But such raids proved so profitable that the vikings soon began to take greater things in hand; they began to ally themselves in confederacies: two, six or a dozen sea-kings would join their forces for something more than a desultory raid.
Assembling in greater and ever greater confederacies, the Danes fell upon the northern kingdoms, no longer merely to harry but to conquer and occupy them.
Similarly the various cities were divided in their allegiance between the Achaean and the Aetolian leagues, with the result that Arcadia became the battleground of these confederacies, or fell a prey to Sparta and Macedonia.
The Saxon towns, during the following century, were joining to protect their common interests, and indeed at this period town confederacies in Germany, both North and South, were so considerable as to call for the declaration against them in the Golden Bull of 1356.
Powell sets forth the laws of real and artificial kinship among the North American tribes, as well as tribal organization and government, the formation of confederacies, and the intricate rules of artificial kinship by which rank and courtesy were established.