Ancient Egypt existed from around 2800 BC to the birth of Christ. Egyptian civilization developed along the Nile River and Mediterranean Sea. Egyptian society was strictly hierarchical, with the powerful pharaoh and nobility at the top ruling over craftsmen, farmers, and slaves at the bottom. Egyptians wore simple white linen clothing that differed between social classes and genders. Notable Egyptian architecture included pyramids constructed from stone blocks and mudbrick homes of nobles and peasants. Writing began as hieroglyphic pictures but evolved into a more efficient script used by scribes to record the language and history of ancient Egypt.