Ibn Khaldun was a North African polymath who is widely considered the father of modern sociology, historiography, and economics. His most famous work, the 'Muqaddimah' (Introduction), was the first attempt to find a pattern in the changes of human society. He introduced the concept of 'Asabiyyah' (social cohesion or group solidarity) to explain why some civilizations rise while others fall. He argued that history is cyclical, with nomadic groups eventually conquering sedentary ones, becoming civilized, and then losing their cohesion and being replaced. His insights into the division of labor and the role of the state in the economy predated the work of Adam Smith and modern social scientists by several centuries. He remains a towering figure for his scientific approach to the study of human civilization.