IV.

How the Pyramid Form Developed

The Egyptian pyramids developed from royal tombs of the earliest periods of Egyptian history. In the 1st and 2nd dynasties (2920 bc-2770 bc and 2770 bc-2649 bc), kings were buried at the city of Abydos in graves topped with a pile of clean sand inside low-lying brick walls. By the 3rd Dynasty (2649 bc-2575 bc), kings were being buried underneath large mud brick rectangles called mastabas, from the Arabic word meaning “bench.”

King Djoser, who reigned from 2630 bc to 2611 bc, built a more elaborate royal tomb known as the Step Pyramid at Şaqqārah. This tomb started out as a mastaba, but its architect, Imhotep, first expanded the mastaba then topped it with successively smaller mastabas. In the end, Djoser’s tomb looked like a rectangular wedding cake with six layers.

The Step Pyramid and later pyramids of the 3rd Dynasty were constructed of small, almost brick-sized stones that were laid in vertical courses and inward-leaning to create the sloped sides.

King Sneferu, the father of Khufu, built the initial true pyramids, developing the new technique during construction. The earliest true pyramid, at the town of Maydūm, began as a step pyramid with inward-leaning walls and eight levels. After working on the structure for 14 years, Sneferu moved his burial ground north to Dashur for unknown reasons, and construction began on another pyramid. This one, too, was made of stone blocks that leaned inward. The architects had designed it with an angle of 60 degrees (to the ground), but as the pyramid rose, it started to sink because of the weight and angle of the stones. To solve this problem, the builders put up an outer supporting wall, giving the half-finished pyramid a shallower angle of 55 degrees. After this, the architects finished the upper portion of the pyramid off with a slope of only 43 degrees. This shift in angle from 55 to 43 degrees gives this pyramid its name—the Bent Pyramid.

During construction of the Bent Pyramid, the architects made a discovery: On the upper portion, instead of leaning the stones inward, they laid down horizontal layers of larger stone blocks. With the new technique, the pyramid shape resulted because each level was slightly smaller than the one it lay upon. The new technique was then used to construct another giant pyramid for Sneferu, now called the North Pyramid, located about 1.6 km (1 mi) north of the Bent Pyramid. It proved so successful that Sneferu returned to Maydūm, while construction was still in progress on the two Dashur pyramids, and refined the Maydūm pyramid by adding an outer level constructed with the new approach.

All the pyramid builders of the 4th Dynasty (2575 bc-2467 bc), including the builders of the Great Pyramid at Giza, used Sneferu’s new technique. Over the course of the 5th Dynasty (2465 bc-2323 bc), however, the quality of the royal pyramids declined. The cores were made of smaller blocks of stone, laid more irregularly. By the end of the Old Kingdom around 2134 bc, the pyramids had a core of shoddy masonry and debris covered with a veneer of fine limestone.

After a chaotic period in Egyptian history called the First Intermediate Period (2134 bc-2040 bc), Egyptian kings chose to be buried in pyramids at their new capital city near modern Lisht. These pyramids of the Middle Kingdom resemble those of the late Old Kingdom, being loosely constructed of rough stones, debris, and mud-brick, and coated with fine limestone. However, the associated temples were much larger than those of the Old Kingdom.

The pyramids built early on in the Middle Kingdom were entered through an opening cut into the center of the north face, from which a simple passage descended. By the reign of Senwosret II (1897 bc-1878 bc), builders altered this simple and predictable arrangement. At his pyramid at Illahun the entrance led to a system of shafts on the south side of the pyramid and a passageway that circled the burial chamber before opening into it. During the rest of the Middle Kingdom, royal pyramids became increasingly complicated in plan, presumably to foil the intentions of tomb robbers.

In the New Kingdom (1550 bc-1070 bc), kings were no longer buried in pyramids. The site of royal tombs had shifted to the Valley of the Kings near modern Luxor. But private citizens used small pyramids for tombs that were barely higher and wider than the entrances to them.