in 2010 The earliest Egyptian pyramids were step pyramids. In the
First Dynasty at
Saqqara, a large step pyramid like structure was found within the interior of Mastaba 3808 dating to the reign of the pharaoh
Anedjib. Egyptologist Walter B Emery found other
mastabas of this late 1st Dynasty period that may have been of similar design in which several inscriptions depicting step pyramids during this era are also found, mostly credited to Anedjib's successor
Qa'a. The first recognized step pyramid, however, dates to the beginning of the
Third Dynasty attributed to the pharaoh
Djoser. Though Egyptologists often credit his vizier
Imhotep as its architect, the Dynastic Egyptians themselves, contemporaneously or in numerous later Dynastic writings about the character, did not credit him with either the designing of the
Pyramid of Djoser or the invention of stone architecture. Djoser's pyramid was first built as a square mastaba like structure, which as a rule were known to otherwise be rectangular, and expanded several times by way of a series of accretion layers to produce the stepped pyramid structure we see today. Later pharaohs, including
Sekhemkhet and possibly
Khaba, built similar structures, known as the
Buried Pyramid and the
Layer Pyramid, respectively. In the
Fourth Dynasty, the Egyptians began to build "true pyramids" with smooth sides. The earliest of these pyramids, located at
Meidum, was first constructed as a finished "tower-shaped" step pyramid like structure and later converted to a true pyramid which at some point this layer collapsed. Though there is disagreement among Egyptologists whether
Sneferu or his predecessor
Huni built the tower core, it is generally accepted Sneferu at the least was responsible for converting it to a true pyramid. Sneferu is also credited with building two other pyramids, the
Bent Pyramid and the
Red Pyramid at
Dahshur, which were the first true pyramids to be built as such from the beginning. Though with this innovation the outwardly appearance of Egyptian stepped pyramids came to an end in favor of smooth-sided true pyramids, the pyramids that followed whose cores have been exposed all show some form of stepped pyramid at their center. ==Africa==