Analysis of information sources in references of the Wikipedia article "한자동맹" in Korean language version.
[A] grant of about 1157 [...] conferred perpetual protection upon the homines et cives Colonienses. As long as they paid established dues they were to be treated as the king's men and no fresh charges would be levied on them without their consent. By this time they had some form of corporate organization with a headquarters in London [...].