The Egyptian pharaoh known for the Great Pyramid of Giza is Khufu, also known as Cheops. He ruled during the Fourth Dynasty of the Old Kingdom around 2589–2566 BC. The Great Pyramid, which served as his tomb, is one of the most remarkable architectural feats of ancient Egypt and the largest of the three pyramids at Giza. Khufu's reign is marked by the organization of vast resources and labor to construct the pyramid, reflecting the sophistication of Egyptian engineering and administration. The pyramid remains a lasting symbol of the power and religious beliefs of ancient Egyptian civilization.