The term itself was coined by nineteenth century historians and the distinction between the Old Kingdom and the Early Dynastic Period is not one which would have been recognized by Ancient Egyptians. Not only was the last king of the Early Dynastic Period related to the first two kings of the Old Kingdom, but the 'capital', the royal residence, remained at Ineb-Hedg, the Ancient Egyptian name for Memphis. The basic justification for a separation between the two periods is the revolutionary change in architecture accompanied by the effects on Egyptian society and economy of large-scale building projects.The Old Kingdom is most commonly regarded as the period of time when Egypt was ruled by the Third Dynasty through the Sixth Dynasty (2686 BCE – 2181 BCE). Many Egyptologists also include the Memphite Seventh and Eighth Dynasties in the Old Kingdom as a continuation of the administration centralized at Memphis. While the Old Kingdom was a period of internal security and prosperity, it was followed by a period of disunity and relative cultural decline referred to by Egyptologists as the First Intermediate Period. During the Old Kingdom, the king of Egypt (not called the Pharaoh until the New Kingdom) became a living god, who ruled absolutely and could demand the services and wealth of his subjects.
Under King Djoser, the second king of the Third Dynasty of the Old Kingdom, the royal capital of Egypt was moved to Memphis, where Djoser established his court. A new era of building was initiated at Saqqara under his reign. King Djoser's architect, Imhotep is credited with the development of building with stone and with the conception of the new architectural form—the Step Pyramid. Indeed, the Old Kingdom is perhaps best known for the large number of pyramids constructed at this time as pharaonic burial places. For this reason, the Old Kingdom is frequently referred to as "the Age of the Pyramids."