Friedrich Keutgen, 1911 Encyclopædia Britannica, Volume 6… (1911)
“ The period of the rise of cities till well on in the 13th century was naturally a period of expansion and of a considerable amount of freedom of trade. It was only afterwards that a protectionist spirit gained the upper hand, and each town made it its policy to restrict as far as possible the trade of strangers. In this revolution the rise of the lower strata of the population to power played an important part. The craft-gilds had remained subordinate to the Rat, but by-and-by they claimed a share in the government of the towns. ”
