The complex was built by the architect Anupy for king Senusert II in the 12th dynasty. It consists of the mud brick pyramid and eight mastabas to the north of the pyramid, and the so-called Queen’s pyramid.
It is considered the first of the giant mud brick pyramids. It had a length of 106 m, a slope of 42 35 and a height of 48.6 m (Lehner, 1997). The structure of the pyramid is supported with a natural rocky core that was cut to accept a pyramid top, large limestone cross walls provided support for the brick sectors, which were then cased in limestone
The layout of the pyramid reflects the fact that the pyramid marks a complete departure of the usual arrangement of an entrance on the north. Instead, the pyramid is entered by a narrow vertical shaft at the east end of its south side.
The king’s body and funerary furniture were probably carried down this shaft, but it was too narrow for the red granite sarcophagus and blocks of the burial chamber. This disguise, which required a new position for the pyramid’s entrance, may be the architect’s solution to the risk of the pyramid being robbed (Lehner, 1997). A sarcophagus was found in the burial chamber. It was built using great slabs of granite (Silliotti, 2003). The layout of corridors and rooms within the pyramid is unique and may reflect beliefs concerned with Osiris and the afterlife.