Birmingham is one of England's principal industrial centres and has a history of industrial and scientific innovation. It was once known as 'city of a thousand trades' and in 1791, Arthur Young (the writer and commentator on British economic life) described Birmingham as "the first manufacturing town in the world". Right up until the mid-19th century Birmingham was regarded as the prime industrial urban town in Britain and perhaps the world, the town's rivals were more specific in their trade bases. Mills and foundries across the world were helped along by the advances in steam power and engineering that were taking place in the city. The town offered a vast array of industries and was the world's leading manufacturer of metal ware, although this was by no means the only trade flourishing in the town. By the year 2000, of the 4,000 inventions copyrighted annually in the UK, 2,800 came from within a 35-mile radius of Birmingham. Peter Colegate of the Patent Office stated that "Every year, Birmingham amazes us by coming up with thousands of inventions. It is impossible to explain but people in the area seem to have a remarkable ability to come up with, and have the dedication to produce, ideas." While the time line of industry and innovation listed below is extensive, it is by no means a comprehensive list of Birmingham's industrial and scientific achievements, more a guide to highlight the great diversity in the city's industrial might, which can still be seen today. Pre-17th century Birmingham's reputation for trade and innovation really begins to take off in the 12th century with the expansion of a market held there by the De Birmingham family. Around this time the Birmingham Bull Ring begins to take shape, and with the town's markets there arises a necessity to produce items good enough to be sold elsewhere. Medieval crafts in the town include textiles, leather working and iron working, with archaeological evidence also suggesting the presence of pottery, tile manufacture and probably the working of bone and horn. The following period sees the new town expand rapidly in highly favourable economic circumstances and there is archaeological evidence of small-scale industries taking place such as kilns producing the distinctive local Deritend ware pottery. The following decades, Birmingham becomes very productive in several trades metal working, including making small, high value items, possibly jewellery or metal ornaments, for Master of the