Final answer:
The Great Pyramid of Giza was built by King Khufu during the height of the Old Kingdom, with the assistance of around twenty thousand workers over twenty years.
Step-by-step explanation:
The Egyptian ruler who built The Great Pyramid of Giza was King Khufu. A testament to the power of the Egyptian state, the construction of these massive structures was enabled by the prosperity and ingenuity of the Old Kingdom. The workforce for the construction consisted of around twenty thousand workers, rather than the 100,000 reported by Herodotus, and took about twenty years to complete.
These laborers were not enslaved but possibly enjoyed a higher standard of living compared to other Egyptians. King Khufu's pyramid is part of a series of pyramids, including those built by his son Khafre and grandson Menkaure, serving as burial places, memorials, and worship sites.