This document discusses nomadic peoples and settled societies in the Islamic world, Byzantium, and China between 1000-1200 CE. It analyzes how each region incorporated or reacted to nomadic groups. The Islamic Empire readily absorbed Turkic invaders due to its universal religion of Islam, history of cultural diversity, and need for military support. Byzantium viewed outsiders as barbarians and failed to adapt. Europe expanded outward, while China considered others barbarians but some groups adopted Chinese culture. The most insular societies like Byzantium declined the most, while flexible empires like the Islamic Empire thrived.