The making and selling of goods diverged e.g. as the cloth merchant severed from the tailor and the leather merchant severed from the butcher. These craftsmen formed themselves into guilds. They sought charters to require all craftsmen to belong to the guild of their craft, to have legal control of the craft work, and be able to expel any craftsman for disobedience. These guilds determined the wages and working conditions of the craftsmen and petitioned the borough authorities for ordinances restraining trade, for instance by controlling the admission of outsiders to the craft, preventing foreigners from selling in the town except at fairs, limiting purchases of raw materials to suppliers within the town, forbidding night work, restricting the number of apprentices to each master craftsmen, and requiring a minimum number of years for apprenticeships. In return, these guilds assured quality control. In some boroughs, they did work for the town, such as maintaining certain defensive towers or walls of the town near their respective wards. In some boroughs, fines for infractions of these regulations were split between the guild and the government. This jurisdiction was sought from the towns governments, which were controlled by the merchant guilds, with great difficulty. In London, this power was broken in 1261 by the craftsmen forcing their way into the town-mote. By this brute show of strength, they set aside the opinion of the magnates and selected their own candidate to be mayor. The citizens of London had a common seal for the city. London merchants traveled throughout the nation with goods to sell exempt from tolls. Most of the London aldermen were woolmongers, vintners, skinners, and grocers by turns or carried on all these branches of commerce at once. There are three inns in London. Care- giving hospitals such as "Bethleham Hospital" were established in London. Only tiles were used for roofing in London, because wood shingles were fire hazards and fires in London had been frequent. Some areas near London are disclaimed by the King to be royal forest land, so all citizens could hunt there and till their land there without interference by the royal foresters. A gold penny was minted, which was worth 2s. of silver. Jews were allowed to make loans with interest up to 2d. a week for 20s. lent.