The term 'augusti' refers to the co-emperors of the Roman Empire during the Tetrarchy, a system established by Emperor Diocletian around 293 CE. This division of power created a hierarchical structure with two senior emperors, called Augusti, and two junior emperors, known as Caesars. The establishment of this system aimed to restore stability and effective governance during the Crisis of the Third Century, which had plagued the empire with internal conflict and external threats.
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