Xiao He
In 201 BC, Emperor Gaozu wanted to build his capital in Luoyang but Zhang Liang suggested Xianyang instead, because it was surrounded by natural defences such as mountain passes, and had fertile land for agriculture. Gaozu put Xiao He in charge of the constructions in Xianyang. Two years later, the project was completed and Xiao He took Gaozu on a tour of Xianyang. The new palace was called Weiyang Palace and served as the central imperial palace throughout the Western Han dynasty and Xin dynasty. Gaozu also renamed Xianyang to "Chang'an", which meant "long-lasting peace".