At Carnuntum, a vital military and political location in the Roman Empire, Emperor emeritus Diocletian convened a meeting with two key figures of the Tetrarchy: Galerius, who was the Augustus of the East, and Maximianus, the recently returned former Augustus of the West. This meeting was crucial as it came at a time when the Roman Empire was embroiled in civil wars that jeopardized its stability and governance. Diocletian had abdicated his position in 305, allowing a new generation of leaders to take charge, yet the resultant power struggles had led to increasing turmoil across the empire.

During these discussions, the three leaders focused on reconciling their differences and laying down a plan to restore peace. The interplay of authority between the East and West under the Tetrarchy had created factions, and Diocletian, though retired, still wielded significant influence and was viewed as a stabilizing force. The meeting emphasized the need for cooperation and compromises that were essential to unify their respective regions and prevent further conflict.

The council lasted several days and involved intense negotiations, showcasing the complexities of maintaining power in a divided empire. They deliberated on military strategies, governance, and how to present a united front against external threats while also addressing the unrest within their ranks. This convergence of emperors represented both a culmination of previous efforts by Diocletian in establishing the Tetrarchy and a critical juncture in Roman political history.