- The first three Chinese dynasties, the Xia, Shang and Zhou, are often referred as the '3 holy dynasties'.
- Qin Shi Huang, ruler of the Qin Dynasty became the first emperor of a unified China.
-The first dynasty established in China was the Xia Dynasty. Most of what is known about this early dynasty comes from legends.
The main reason for the wall's construction had always been defense. Since China's first dynasty, the empire faced a near-constant threat of attack from the nomadic tribes to the north. This included those famed Mongols as well as lesser-known groups like the Xiongnu and the Göktürks.
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Mekong, Tiber and Danube.
