An emperor is the ruler of an empire. In historical contexts, an emperor holds supreme authority over a vast territory and governs with absolute power. The term "emperor" is often associated with ancient civilizations such as the Roman Empire, the Chinese Empire, or the Byzantine Empire. Emperors typically have a hierarchical position above kings and other rulers, and their rule is characterized by their dominion over multiple regions or nations. They exercise control over political, military, and administrative affairs, shaping the destiny of their empire.