Bent Pyramid: Sneferu’s Transitional Royal Monument in Egypt
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- Egypt
- Primary era
- Bronze Age
- Eras represented
- Bronze Age
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- Egyptian
- Site type
- Burial
- Remains
- Pyramid
On this page19 sections
History
The Bent Pyramid is a royal monument at Dahshur in Egypt, built by the ancient Egyptians for the Old Kingdom pharaoh Sneferu during the Fourth Dynasty, probably around 2600 BCE. It was begun after work at the stepped pyramid of Meidum and formed part of Sneferu’s experiments with pyramid design. The monument is a transitional stage between stepped pyramids and smooth-sided true pyramids, and it was the first pyramid planned from the outset as a true pyramid, although its form changed during construction.
Foundation and changing design
The pyramid was originally planned with a square base about 157 to 157.3 metres on each side and sides rising at approximately 58 degrees, possibly as steeply as 60 degrees. A second phase enlarged the base and lowered the angle to about 54 to 54 degrees 27 minutes. In the third phase, the upper section was built at approximately 43 degrees. This alteration created the distinctive change of angle that gives the monument its modern name, the Bent Pyramid. Its ancient name is generally translated as “Southern Shining Pyramid” or “Sneferu Shines in the South.”
The reasons for the altered design remain debated. Possible explanations include instability caused by the steep angle, settlement of the soft clay-schist ground, difficulties created by added masonry, problems with ramps near the summit, and the need to reduce construction stresses. Kurt Mendelssohn proposed that the change followed the collapse of the Meidum Pyramid, but that connection remains hypothetical. Settlement at Dahshur produced cracks in the pyramid’s masonry, particularly in the corridors and chambers. Some cracks were filled with plaster, and cedar beams were later installed inside the monument. These beams have been interpreted as supports, funerary equipment, or a structure associated with the burial.
Sneferu’s funerary complex
The quality and unfinished character of parts of the Bent Pyramid may have encouraged Sneferu to commission the Red Pyramid farther north at Dahshur. The Bent Pyramid probably functioned as a cenotaph or cult monument rather than as Sneferu’s principal burial place, although the location of his burial remains unresolved. Most Egyptologists regard the Red Pyramid as his likely tomb, while Ahmed Fakhry proposed that Sneferu was buried in the upper chamber of the Bent Pyramid.
The Bent Pyramid was completed with a reduced temple program and probably served as a cult pyramid for the Red Pyramid. Its funerary and cult installations were restored or reactivated during the Twelfth Dynasty and again during the Late Period, showing that Sneferu’s cult continued long after his reign. The complex’s unusual double system of entrances and chamber groups has no fully accepted interpretation. The suggestion that the monument was a “double pyramid” symbolizing Upper and Lower Egypt is not supported by archaeological finds.
Exploration and archaeological investigation
European travelers investigated the monument from at least the seventeenth century. John Shae Perring carried out the first systematic exploration in 1839 and discovered the western entrance. Later investigations involved Karl Richard Lepsius, Flinders Petrie, Abdel Salam Hussein, Ahmed Fakhry, Vito Maragioglio, Celeste Rinaldi, Josef Dorner, and the German Archaeological Institute.
After 1945 to 1946, Abdel Salam Hussein cleared the internal chambers and revealed the cedar framework, bat remains, and graffiti identifying Sneferu. His documentation was not preserved. Ahmed Fakhry later excavated the wider complex, including the funerary temple, during the early 1950s and published the results. Since 2015, the Bent Pyramid has also formed part of the international ScanPyramids exploration program, conducted by the HIP Institute with the University of Cairo’s engineering faculty under the authority of Egypt’s Supreme Council of Antiquities.
Remains
The main pyramid
The pyramid stands on a square base approximately 188.6 to 189.4 metres long. Its original height was about 104.7 to 105.1 metres, compared with a present height of approximately 101.1 metres. Its estimated volume is about 1,440,808 cubic metres. The four faces are aligned approximately with the cardinal directions, with a reported orientation error of about 9 minutes 12 seconds. The lower section rises at approximately 54 degrees 27 minutes to 54 degrees 34 minutes, reaches about 47 metres above the base, and supports an upper section that rises approximately 57.7 metres above the bend at an angle of about 43 to 43 degrees 22 minutes.
Construction and casing
The earliest construction phase used inclined layers of masonry derived from techniques developed for stepped pyramids. Offset joints near the lower and upper descending corridors provide indirect evidence for this stage. In the second phase, a belt approximately 15.70 metres wide was added around the earlier structure, enlarging the base to about 188 metres. This masonry also used inclined layers and was covered with fine Tura limestone, a light-colored stone quarried near ancient Memphis and widely used for royal monument casing.
At an angle of 54 degrees, the pyramid would have reached approximately 129.4 metres and had a volume of about 1,524,000 cubic metres if that slope had continued to the summit. Construction at this angle stopped at approximately 49 metres. The final upper section used horizontal courses, as at the Red Pyramid, and was also faced with fine Tura limestone. This change reduced internal pressure and produced the pyramid’s bent profile.
Much of the exterior casing remains, although many blocks were removed through modern quarrying. The removal appears to have been curtailed by the danger created by the steep, unstable faces. Peter James attributed the survival of much of the casing to relatively wide gaps between casing elements, which may have acted as expansion joints against thermal movement. The masonry has irregularly concave faces, a feature also observed at the Great Pyramid. The unusually good preservation of the exterior has not established whether the internal core incorporated stepped layers.
Northern entrance and lower chambers
Two independent entrances lead to separate internal chamber systems. The northern entrance is about 11.80 metres above ground level and retains its original position within the casing. Its single-block lintel is approximately 3.18 metres long and 1.50 metres high. Beyond it, a descending passage runs for approximately 74 metres. The passage is about 1.05 metres high and 1.10 metres wide, with a slope of approximately 25 degrees. Its ceiling uses recessed slabs arranged to relieve the weight above in the manner of a corbelled vault. A corbelled vault is formed by horizontal courses that project inward until they meet or are capped, rather than by wedge-shaped stones arranged around a true arch.
The northern passage reaches a subterranean antechamber approximately 5.40 metres long and 12.60 metres high. Its limestone roof is corbelled. The chamber and adjoining corridors contain plaster-filled cracks, pairs of opposing holes that may have held beams, construction debris, roughly squared blocks, and graffiti. A steep, narrow stairway rises to the lower main chamber, whose floor is approximately 6.50 metres above the adjoining corridor. The chamber measures about 4.96 by 6.30 metres, and its corbelled roof reaches approximately 17.20 metres. No evidence of a burial procedure has been identified there.
Chimney and connecting gallery
A southern opening from the lower chamber leads through a short passage to a vertical shaft commonly called the chimney. The shaft is approximately 8.90 metres high and lies nearly on the pyramid’s central axis, with an offset of about one metre. It contains an unusual arrangement of superimposed cavities, whose purpose is unknown. The passage floor rests on debris filling a cavity approximately eight metres deep.
A later connecting gallery was cut through the masonry from the lower chamber toward the upper chamber system. It is approximately 0.74 metres wide and 0.92 metres high, slightly winding and descending as it links two different levels while avoiding part of the pyramid. A papyrus cord discovered by Perring indicated the gallery’s opening. Traces of a built staircase survive on the corridor walls before the lower chamber. These traces have led archaeologists to propose that a large temporary staircase once provided access to the gallery and was later dismantled.
Western entrance and upper chambers
The western entrance is approximately 33.22 to 33.32 metres above ground and is offset from the pyramid’s central axis. It was concealed beneath the casing until investigations in the twentieth century cleared it. The western descending passage is approximately 67.66 metres long. Its first 21.81 metres slope at about 30 degrees 9 minutes, followed by a section inclined at approximately 24 degrees 17 minutes. A cavity 1.28 metres deep is cut into the floor at its lower end, with comparable cavities known from the Meidum and Red pyramids.
The passage leads to a horizontal section approximately 20 metres long containing two early portcullis systems. A portcullis is a heavy blocking stone or barrier that closes a passage by sliding into position. Here, the stones moved down inclined ramps of approximately 45 degrees rather than dropping vertically. The outer blocking stone remains in place and has a rectangular opening through it. The inner stone was never fully closed and remains supported by an ancient cedar beam. The portcullis chambers have corbelled roofs and represent the earliest known use of such blocking systems on an inclined plan, a design later used repeatedly during the Middle Kingdom.
Between the two portcullis systems, a large rectangular shaft approximately four metres deep was found beneath a floor slab. Its purpose remains unknown. Five pairs of opposing recesses survive in the walls of the horizontal section. The connecting gallery enters the northern side wall of the western passage immediately beyond the shaft. Strong drafts and noises were reported there during very windy conditions, and a further external connection was proposed but not demonstrated.
The upper chamber measures approximately 7.97 by 5.26 metres and rises about 16.50 metres beneath a four-sided corbelled roof. Its masonry was left rough and appears not to have been fully finished. Gypsum covered cracks in the walls. The floor was raised approximately 4.20 metres with small stone blocks. Excavations in 1946 to 1947 exposed an imposing cedar framework approximately 4,600 years old. No sarcophagus was found. The masonry and cedar remains in the lower part of the chamber have been interpreted variously as a coffin support, a substitute for a sarcophagus, preparation for finishing the vault, or reinforcement against collapse.
One block in the upper chamber bears construction graffiti in hieroglyphs naming Sneferu. A few hieroglyphic inscriptions from the Late Period were also recorded near the northern entrance. A box found about 15 metres from the bottom of the upper descending passage contained the mummified remains of an owl and five bats. Ahmed Batrawi assigned them to the Fourth Dynasty, while Ahmed Fakhry proposed a Ptolemaic date.
Enclosure, causeways, and temples
Enclosure and causeway
A square limestone enclosure wall surrounded the pyramid complex. It measured approximately 298.55 metres on each side and was about two metres thick in the French description. The enclosure also incorporated the satellite pyramid within an expanded section. A limestone-paved causeway approximately 700 to 704 metres long led from the northeastern part of the complex toward the valley temple. Low limestone walls bordered it, and it entered the enclosure from the north, an unusual arrangement among pyramid complexes. A second causeway toward a dock or landing stage has been proposed, but excavation has not confirmed it.
Snofru Valley temple
A separate temple in the Snofru Valley stood approximately halfway between the pyramid and the valley temple. This walled rectangular building had an entrance on its southeastern side, storage rooms, an antechamber, an inner court, six statue niches, and ten rectangular pillars arranged in two rows. Reliefs showed royal estates presenting offerings. A causeway approximately 140 metres long connected the temple to the valley temple. Priests serving Sneferu’s cult built dwellings between the temple and its enclosure, and the cult continued there into the Middle Kingdom.
Valley temple
The valley temple measured approximately 47.16 metres long and 26.20 metres wide. Its south-facing front helped form the northern boundary of the court. The building had three sections, including two covered areas enclosing an open court. Its pillars had bevelled edges and decorated reliefs, except for the front row facing the chapel. A harbor basin associated with the complex was discovered beside the lower causeway, with its foundation level approximately 18 metres above sea level. Workers’ barracks and priests’ quarters were found near and within the valley-temple area.
Eastern pyramid temple
The small temple attached to the eastern side of the main pyramid was an offering chapel rather than a fully developed funerary temple. Two large limestone stelae originally stood before it, each approximately nine metres high. One carried Sneferu’s name and is represented by remains now held in the Egyptian Museum in Cairo. The chapel contained three inscribed altars and underwent several modifications. Red graffiti occurs in its inner corners, as well as on parts of the enclosure and the pyramid temple.
Funerary temple
The main funerary temple, excavated by Ahmed Fakhry in 1951 to 1952, measured approximately 47 by 25 metres. It comprised an antechamber, a pillared court, and six chapels. Numerous reliefs were reconstructed from about 1,400 fragments found on the site. The walls carried unusual round-sculpted reliefs, a distinctive feature of Old Kingdom architecture. The temple stands away from the valley edge and was restored during the Twelfth Dynasty and the Late Period.
Satellite pyramid and surrounding landscape
Satellite pyramid
A satellite pyramid lies approximately 55 metres south of the Bent Pyramid. Its original base measured about 52.80 metres on each side, and its height was approximately 26 metres, with faces inclined at about 44 degrees 30 minutes. It was built from relatively coarse local limestone blocks laid in horizontal courses and was originally covered with fine Tura limestone. Much of that casing has been lost through erosion.
A descending northern passage began approximately 1.10 metres above ground. It was originally about 11.60 metres long and inclined at 34 degrees. A short horizontal passage led to an ascending corridor inclined at approximately 32 degrees 30 minutes. This expanded into a small gallery containing blocking stones and red construction lines. The chamber lies within the pyramid body, approximately seven metres above the surrounding ground, beneath a corbelled roof. Its length is only about 1.6 metres, so it could not contain a normal burial and is identified as a cult chamber. A roughly four-metre-deep shaft in its southeastern floor was probably dug by treasure hunters.
The satellite pyramid had its own eastern offering installation, including an alabaster altar and two monolithic stone stelae approximately five metres high. It is regarded as a cult pyramid, probably associated with the king’s ka, the enduring spiritual aspect of a person in ancient Egyptian belief. An earlier interpretation identified it as a possible tomb for Queen Hetepheres I.
Landscape and settlement
The surrounding landscape includes an artificially levelled pyramid plateau, escarpments, quarry trenches west and south of the pyramid, smaller tombs, an ancient garden enclosure, water basins, and a wadi channel linking the pyramid area with a harbor. Parts of the channel and its southern slope were deliberately modified. The garden enclosure and basins have been interpreted as landscape counterparts to funerary rites, while the enclosure may also have created a habitable environment in the desert. Together, the arranged plateau, channels, trenches, and surrounding tombs emphasized the monument’s scale, social hierarchy, and royal power.
North of the valley temple, geophysical evidence indicates dense occupation across an area approximately 300 by 200 metres, with rectangular plots grouped along two streets. Excavations in 2018 exposed a mud-brick building about 30 by 35 metres. Its walls were coated with mud plaster and white lime plaster. The structure contained a complex western interior, open eastern spaces, and a northern courtyard with storage rooms.
Early Fourth Dynasty pottery from the settlement includes beer jars, bread moulds, and storage vessels. Numerous blue faience tiles of different sizes and forms were also recovered, including large pieces probably used on floors or walls. Their presence, together with the building’s arrangement, indicates occupation over an extended period. Scientific study of the pyramid’s casing identified limestone from the Tura quarries across the Nile. The stone was interpreted as having been cemented with an artificial calcium-silicate binder, possibly made with diatomaceous earth from the Faiyum.
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