Who did bild the wall?

The person or, in this case, people that built the Great Wall of China were criminals and peasants. The Great Wall was built in ancient times. At that time, China's emperor was Shi Huangdi. He was the one that ordered the Great Wall to be built. He was also the one that thought peasants and criminals should build it. The Great Wall united China and also stopped invaders (mainly Mongolians) from conquering China.