He was the first ruler of unified china. He started in the 3rd Century BCE.
In that same time, Shi created the Qin dynasty, This was the first empire in straight forward china. This dynasty also stared the great wall of china.
Unfortunately, Shi Died not too long after he became a ruler. Liu Bang took over his place in 206 and created on of the most recognized dynasty's.
The Han dynasty was the second most recognized dynasty of unified china. They did much more than the QIn. They expanded the wall and made the empire bigger. This happened in the 1st Century.
Zheng He was the first important ruler of china and the reason why was because he created the dynaty that made china much different. He became ruler in the 12 century.
This dynasty is the most important dynasty in china. It expanded the empire round china and they invented many more things than the past dynasty's. They started in the 12th century until china was like today in the 17th century.