On a more practical level, the Duke of Zhou expanded and codified his brother's feudal system, granting titles to loyal Shang clansmen and even establishing a new "holy" city at Chengzhou around 1038 BC. Laid out according to exact geomantic principles, Chengzhou was the home of King Cheng, the Shang nobility, and the nine tripod cauldrons symbolic of imperial rule, while the Duke continued to administer the kingdom from the former capital of Haojing. Once Cheng came of age, the Duke of Zhou dutifully gave up the throne without trouble.