I’ve recently watched @DiocletianIsBetterThanYou's video on politics in the age of Diocletian, and was fascinated by Carausius' propaganda painting himself as brother to Diocletian and Maximilian - the very same people he's usurping against. I've been thinking about similar cases of usurpers basing their legitimacy on the “legitimate” government and indeed, two more Tetrarchy era came to mind. Both Maxentius and Constantine tried to join the Imperial College based on the standings of their fathers and fathers-in-law (even as Galerius responded to Maxentius usurpation with an invasion—although iirc Maxentius was careful enough to not style himself as Caesar or Augustus at first, but only as princeps, in an unsuccessful case not to anger Galerius).
Much later in Byzantine history, Romanos I Lekapenos is perhaps similar too, first styling himself as regent and “father of the emperor” (while marrying his daughter to the minor Constantine VII as well) before crowning himself Emperor. Nikephoros Phokas and Tzimiskes similar seem to have justified their power by ruling for Basil II, who was still a child. Otherwise, I can't think of any other cases in Roman History.*
So, am I simply missing cases where usurpers tried to co-opt the legitimacy of the very people they're rebelling against? Or was the tetrarchy simply a unique situation for such usurpers? And in the case of Maxentius, how did he manage to supersede his father after basing his legitimacy on him?
* The only case I can think of which is remotely similar would be Zenobia/Vallabathus, who still minted coins with Claudius II on them, even as she took part of his territory. But that seems to be more about accepting his legitimacy, and less about actually drawing her own from it.
Much later in Byzantine history, Romanos I Lekapenos is perhaps similar too, first styling himself as regent and “father of the emperor” (while marrying his daughter to the minor Constantine VII as well) before crowning himself Emperor. Nikephoros Phokas and Tzimiskes similar seem to have justified their power by ruling for Basil II, who was still a child. Otherwise, I can't think of any other cases in Roman History.*
So, am I simply missing cases where usurpers tried to co-opt the legitimacy of the very people they're rebelling against? Or was the tetrarchy simply a unique situation for such usurpers? And in the case of Maxentius, how did he manage to supersede his father after basing his legitimacy on him?
* The only case I can think of which is remotely similar would be Zenobia/Vallabathus, who still minted coins with Claudius II on them, even as she took part of his territory. But that seems to be more about accepting his legitimacy, and less about actually drawing her own from it.