During the 11th and 12th centuries, Boston grew into a notable town and port. In 1204, King John vested sole control over the town in his bailiff. That year or the next, he levied a "fifteenth" tax ("") of 6.67% on the moveable goods of merchants in the ports of England: the merchants of Boston paid £780, the highest in the kingdom after London's £836. Thus, by the opening of the 13th century, Boston was already significant in trade with the continent of Europe and ranked as a port of the Hanseatic League. In the thirteenth century it was said to be the second port in the country. Edward III named it a staple port for the wool trade in 1369. Apart from wool, Boston also exported salt, produced locally on the Holland coast, grain, produced up-river, and lead, produced in Derbyshire and brought via Lincoln, up-river.