7th Grade World History By WARRIOR 4000 BCE Settlements in West Africa 500 BCE Trans Saharan Trade Period: 250 to 900 Classical Maya Period 300 Camels Arrive in West Africa 312 Roman Emperor Constantine begins to support Christianity 476 Fall of Rome 610 Muhammad receives first revelation 622 Muslims flee to Medina 630 Muslims re-take Mecca 632 Muhammad dies Period: 632 to 661 First four leaders of the Islamic Empire