Lonely Planet Central Asia, Bradley Mayhew, Greg Bloom, Paul Clammer, pp. 298, Lonely Planet, 2010, ISBN 978-1-74179-148-8, ... In 1825, by a Silk Road settlement on a tributary of the Chuy River, the Uzbek khan of Kokand built a little clay fort, one of several along caravan routes through the Tian Shan mountains ...