Towns, as distinct from villages, had permanent markets. As towns grew, they paid a fee to obtain a charter for self-government from the king giving the town judicial and commercial freedom. They were literate enough to do accounts. So they did their own valuation of the sum due to the crown so as not to pay the sheriff any more than that. These various rights were typically expanded in future times, and the towns received authority to collect the sum due to the crown rather than the sheriff. This they did by obtaining a charter renting the town to the burghers at a fee farm rent equal to the sum thus deducted from the amount due from the county. Such a town was called a "borough" and its citizens or landholding freemen "burgesses". To be free of something meant to have exclusive rights and privileges with respect to it. Selling wholesale could take place only in a borough. Burgesses were free to marry. They were not subject to defense except of the borough. They were exempt from attendance at county and hundred courts. The king assessed a tallage [ad hoc tax] usually at ten per cent of property or income. In the boroughs, merchant and manufacturing guilds controlled prices and assured quality. The head officer of the guild usually controlled the borough, which excluded rival merchant guilds. A man might belong to more than one guild, e.g. one for his trade and another for religion. Craft guilds grew up in the towns, such as the tanners at Oxford, which later merged with the shoemakers into a cordwainers' guild. There were weavers' guilds in several towns, including London, which were given royal sanction and protection for annual payments (twelve pounds of silver for London. They paid an annual tribute and were given a monopoly of weaving cloth within a radius of several miles. Guild rules covered attendance of the members at church services, the promotion of pilgrimages, celebration of masses for the dead, common meals, relief of poor brethren and sisters, the hours of labor, the process of manufacture, the wages of workmen, and technical education. Henry standardized the yard as the length of his own arm. Trades and crafts, each of which had to be licensed, grouped together by specialty in the town. Cloth-makers, dyers, tanners, and fullers were near an accessible supply of running water, upon which their trade depended. Streets were often named by the trade located there, such as Butcher Row, Pot Row, Cordwainer Row, Ironmonger Row, Wheeler Row, and Fish Row. Hirers of labor and sellers of wheat, hay, livestock, dairy products, apples and wine, meat, poultry, fish and pies, timber and cloth all had a distinct location. Some young men were apprenticed to craftsmen to assist them and learn their craft.