The Egyptian civilization developed along the Nile River valley over 6,000 years. Key periods included the Early Dynastic Period, Old Kingdom, Middle Kingdom, New Kingdom, and Late Period. Egyptian society was governed by pharaohs and centered around agriculture along the Nile. They made advances in tools, timekeeping, and developed hieroglyphic writing to preserve their history, religion, and ideas. Egyptian art and architecture included temples, tombs, and pyramids. Their golden ages occurred during the Old and Middle Kingdoms.