Dynasty IV, 2680-2565 B.C. The three great pyramids at Giza. The largest, the pyramid of King Cheops, is in the rear. To build it required over two million large limestone blocks. The pyramid of King Chephren is in the center and the pyramid of King Mycerinus is in front. The three small pyramids are of Mycerinus's queens. These monumental pyramids are precisely oriented to the four cardinal points. Cheops' pyramid is a square, 756 feet on each side. Its height is over 481 feet and the slope of the sides is 552'.

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