Thinking about the role of Philippe Égalité in the French Revolution.
https://en.wikipedia.org/wiki/Louis_Philippe_II,_Duke_of_Orl%C3%A9ans
I think there were a few Princes and Grand Dukes and so forth involved in the incidents leading up to the February Revolution in Russia,
https://en.wikipedia.org/wiki/February_Revolution
I guess Prince Lvov would be the closest equivalent, although he was more directly involved in the new government:
@evan Taine tells us in his *The French Revolution*, Volume II, that the Duc d'Orléans paid for a mob formed daily at the Jacobin Club in order to intimidate the proceedings of the National Assembly.