History
The region is where Egypt began as a single state. Memphis, founded around 3100 BC at the junction of the valley and the Delta, was the capital of the Old Kingdom, and its kings were buried on the desert edge to the west: Djoser's Step Pyramid at Saqqara, the first large stone building, then the pyramids of Meidum and Dahshur under Sneferu, and the great pyramids of Giza under Khufu, Khafre and Menkaure. The Faiyum rose in the Middle Kingdom, when the kings of the 12th Dynasty turned its lake into a vast water reservoir; the Ptolemies later drained its marshes for farming, and Roman-era Faiyum gave the world its painted mummy portraits.
Cairo itself grew in stages. The Romans held a fortress called Babylon beside the river, where Christian churches clustered. The Arab general Amr ibn al-As founded Fustat beside it in 641, the Tulunids added a new quarter in the 9th century, and in 969 the Fatimids built a walled palace city named al-Qahira, "the Victorious". Saladin began the Citadel in the 1170s, and under the Mamluks from 1250 to 1517 Cairo became the largest city west of China, filling with mosques, schools and caravanserais.
After the Ottoman conquest of 1517 the city declined in status but kept growing. In the 19th century Khedive Ismail laid out a new downtown on European lines, and in the 20th century Cairo spread over both banks and deep into the desert. Tahrir Square was the centre of the protests of 2011 and of the mass demonstrations of 2013 that preceded the military's removal of President Mohamed Morsi.
