What happened in the first millennium?

The first millennium saw significant developments across various regions of the world. It was marked by the rise and fall of empires, such as the Roman Empire and the Byzantine Empire, as well as the spread of major religions like Christianity, Buddhism, and Islam. Technological advancements, such as the use of the wheel and improvements in agriculture, transformed societies. The millennium concluded with the onset of the Middle Ages in Europe, characterized by feudalism and the growth of kingdoms.