If an emperor died without a successor,who was most likely to choose a new emperor?

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In ancient Rome, the army had significant political power and influence. In the absence of a successor, the army was likely to intervene and choose a new emperor, often through their own preferred candidate or the strongest and most capable military leader. This method of choosing a new emperor was common in the Roman Republic and early Empire period.

If an Emperor Died Without a Successor,who Was Most Likely