The first emperor of China, known for unifying the country, was Qin Shi Huang, who reigned from 221 to 210 BCE. Qin Shi Huang, originally the King of the state of Qin, successfully conquered rival states during the Warring States period to establish the Qin Dynasty. His reign is notable for centralizing power, standardizing weights and measures, and creating a unified writing system, which facilitated communication and governance across the vast territory. He is also known for the construction of significant infrastructure such as the early Great Wall of China and a vast network of roads that enhanced trade and military movement.