What is the Tetrarchy and who introduced it?

• A. A system of rule by two rulers; introduced by Diocletian
• B. A system of rule by four rulers; introduced by Constantine
• C. A system of rule by four rulers; introduced by Diocletian
• D. A system of rule by many rulers; introduced by Hadrian

Answer: (C)

The main idea being tested is understanding what the Tetrarchy was: a deliberate system of rule by four leaders designed to stabilize governance over a vast empire. Diocletian introduced it around 293 CE, creating two senior emperors, the Augusti, who ruled the East and West, and two junior emperors, the Caesares, who acted as designated successors and supported the Augusti. This structure allowed for quicker response to crises across different regions and aimed to prevent the kind of civil wars that had plagued Rome when a single ruler died or faced a challenge. It also reorganized administration so power was more evenly shared and succession was planned rather than improvised. The other options don’t fit because the tetrarchy was not just two rulers, not established by Constantine, and not a system with many rulers; it was specifically four rulers established by Diocletian.