At the moment, Oren has achieved a significant state of stability and relative prosperity under the Carrion Vochna. Call it despotic or authoritarian all you want, but the fact of the matter is Oren has returned to a point in which it's fun to roleplay within once again. We, as a state, are progressing exceedingly well. If this rebellion is so you might 'fix' things in the kingdom, then I see no cause for fixing.
I know it's cool to play the rebel, but there are a multitude of forums in which a character or characters may voice their concerns to the government both OOC and IC instead of immediately arming yourselves for war. The whole concept of 'I don't get what I want, ergo I rebel' is an age-old human OOC philosophy that I'm frankly getting tired of. If you wanted change, then you should have actually tried to make some change through legitimate methods as opposed to instantly uprising against supposed 'tyranny'.
Furthermore, your claim cannot be recognized as righteous or just by any stretch of the term. The Tarus dynasty formed a loosely-bound constituent realm of the Holy Oren Empire on which our peerage is based, yes, but you must also take into account that Tarus rule was some of the worst in the history of humanity. The country was at its absolute weakest, hammered by every surrounding entity, and it was about to be completely annexed until the royal family and King Tarus jumped ship and Godfrey took charge. Tarus had no part whatsoever in the reunification of humanity, the forming of the Holy Oren Empire, and its successor, the Imperium.
As well as that, the state formed by Tarus and his vassals no longer exists. It was the basis of the Empire, yes, serving as a metaphorical launch pad, but Renatus as we know it is no longer a real entity, not even as a feudatory. You're claiming the unified realm of humanity...whereas Tarus only had a very unimportant role in the grand scheme of unification, given they only formed one third of the human nations after the shattering of Oren. This would be akin to myself returning on a scion of House de Sarkozy and leading an armed rebellion seeking the throne of Ruska, since 'Ruska was made up of several territories, one of which used to be mine'.
To me it just seems like you would like to be a nation leader for the power of it. There is nothing that needs to be majorly remedied in Oren, no heroic and rightful cause championed by you, and no outrageous totalitarianism displayed by us.
"I hate empires lol" and "Um they're tyrants" is not nearly enough justification for a full-scale uprising.