Shi Huangdi never slept in the same room for two consecutive nights because of the constant fear of assassination.
The main achievement of the Qin is the fact that it unified China, creating the first dynasty, ruled by the first emperor Qin Shi Huang. Other well-known achievements is the creation of the Great Wall and a large army of Terracotta Warriors. The Qin unified China, reformed the ruling system, standardized the language, and left behind the Great Wall and famous Terracotta Army. ... It was also the shortest-lived dynasty.
