The Sui Empire started when the ruling clan conquered Nanjing in 589. Along with the Qin Dynasty, the Sui Dynasty was one of the two dynasties of shortest duration that ruled big empires in the region. The Qin Dynasty had ruled much of the same region 800 years before though their great empire only lasted for 15 years. As the Qin Dynasty did, the Sui Dynasty used the people to carry out huge construction projects and fight large-scale wars to invade other countries. Their Great Wall and Grand Canal ranked among the world's greatest feats of engineering at the time. Their rule was harsh, and their dynasty ended in big rebellions also.