Western civilization began in Europe based on Greco-Roman civilization, emerging either in the 8th or 16th century AD after the Middle Ages. It is defined as having European descendants, western ideologies, developed states, Christianity, and views consistent with modern perceptions of the West. A series of events in Europe drove its rise, including the Renaissance, Reformation, Age of Discovery and Expansion, and Industrial Revolution. It was characterized by intellectual growth, increasing secularization, nationalism, and global imperialism.