By about 3600 BC,
Neolithic Egyptian societies along the
Nile had based their culture on the raising of crops and the domestication of animals. Shortly after 3600 BC, Egyptian society began to grow and advance rapidly toward refined civilization. The unification of societies along the Nile has also been linked to the end of the
African humid period. Funeral practices for non-elites would have been the same as in predynastic times, but the rich demanded more elaborate rituals. Thus, the Egyptians began construction of the
mastabas which became models for the later Old Kingdom constructions such as the
step pyramid.
Cereal agriculture and centralization contributed to the success of the state for the next 800 years. It seems certain that Egypt became unified as a cultural and economic domain long before its first king ascended to the throne in the lower Egyptian city of Memphis. Political unification proceeded gradually, perhaps over a period of a few centuries, as local districts established trading networks and as the ability of their governments to organize agriculture labor on a larger scale increased. Divine kingship may also have gained spiritual momentum as the cults of gods like
Horus, Set and
Neith associated with living representatives became widespread in the country.
Writing system It was also during this period that the Egyptian writing system was further developed. Initially, Egyptian writing had been composed primarily of a few symbols denoting amounts of various substances. The Second Dynasty of Egypt sees the advent of the first known complete sentences in Egyptian
hieroglyphs. Probably the first known such sentence is
a seal impression from
Peribsen's tomb, at the end of the Second Dynasty, dating to ca. 2660–2650 BC. The sentence relates to the unification of Egypt: "Sealing of everything of Ombos (i.e.,
Naqada): He of Ombos has joined the Two Lands for his son, the Dual King Peribsen." By the end of the 3rd dynasty it had been expanded to include more than 200 symbols, both
phonograms and
ideograms. File:Wooden funerary sculpture mask of King Den. 1st Dynasty, Old Kingdom, Third Millenium BC, 2873 BC - 2859 BC. Abydos (composite).jpg|Depiction of king
Den (2873-2859 BC). File:Alabaster vessels from a 1st Dynasty cemetery, Abu Roach. Louvre Museum AF 9149, AF 9148.jpg|Alabaster vessels from a 1st Dynasty cemetery,
Abu Roach. Louvre Museum AF 9149, AF 9148 File:Marble vase from the tomb of Khasekhemwy. Abydos, circa 2700 BCE. Louvre Museum, E 23051.jpg|Marble vase from the tomb of
Khasekhemwy, Second Dynasty. Abydos, circa 2700 BC. Louvre Museum, E 23051 ==First Pharaoh==