Ancient Egypt was a highly advanced civilization that developed along the Nile River valley starting around 3150 BC. It achieved success through organized agriculture, irrigation, dense populations, and social/cultural development. The pharaoh was the absolute ruler, relying on bureaucrats and officials to manage administration, the military, construction projects, trade, and more. The Egyptians made many achievements in construction, mathematics, medicine, ships, and more. Society was stratified but both men and women could own property and had legal rights. Their culture, religion, and highly developed hieroglyphic writing system left enduring legacies.