Leeds boasts a good number of well-developed industries, including textile, wool, clothing, food, printing, as well as engineering branches. The first written mention of the city dates from the end of the eleventh century. At the beginning of the thirteenth century Leeds was known as a market town. During the Industrial Revolution the city found itself in a comfortable position and made a rapid climb. The population increased dramatically, while river and road transport systems experienced a magnificent growth. Over time, sea transport channels linked the city with continental Europe, while a railway explosion contributed to a significant rise, forming almost half of its export. Thus, over time Leeds becomes a real heart transport northern England.