Final answer:
Shi Huangdi, the first emperor of the Qin dynasty, commissioned the building of the Great Wall to protect China's northern borders.
Step-by-step explanation:
The ancient Chinese emperor who commissioned the building of the Great Wall was Shi Huangdi. He was the first emperor of the Qin dynasty, ruling from 246 BCE to 210 BCE. The construction of the Great Wall began around 220 BCE and was primarily intended to protect the empire's northern borders from invasions and attacks.
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