Tetrarchy

Tetrarchy was a political system in when four, powerful, wealthy authorities (usually monarchs) were the rulers, usually with direct, absolute power.

History
The idea of Tetrarchy had started in the later years of the Third Century Crisis, with it's adoption as the new governmental system instituted by the Roman Empire, it marked the end of the Third Century Crisis. There was a slight time of prosperity during its reign. But, its demise would come in 305, when both of the Emperor's 20-year-long terms had ended, both abdicated, ending the Tetrarchy.