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Home / Great Wall / History / Qin Dynasty. The Great Wall of the Qin Dynasty (221BC-207 BC) was built during the reign of Emperor Qin Shi Huang, along the country's northern border to prevent the invasion of Huns. In 221BC, Emperor Qin Shi Huang unified China for the first time after annexing six states.
Related article: the construction of the Great wall of China. Nomadic tribes from territories now a part of Mongolia and Manchuria often swooped down marauding into the areas ruled by the emperor. In 221, B.C., Qin Shi Huang conquered all the surrounding states and united them under his empire.