Napoleon and Hitler with nobility/leaders...?

So ok so I'm starting to realize how much juggling Peter the Great had to do between maintaining his supreme power (authoritarian rule) and not making the nobility angry enough to rebel. Peter overwhelming flipped the social structure, particularly with the Table of Ranks, however, he also compromised with some nobility and allowed them to play a role in the government. So I was wondering how Hitler and Napoleon interacted with the nobility? Did the nobility make any difference at all? I think that with Napoleon the nobility would probably play a more significant role than with Hitler...I guess that with Hitler there wasn't necessarily a nobility--but something along the lines of a dominating social force that had to be dealt with. In the case of Peter the Great, the legitimacy of his crown meant that he didn't need to use force or violence to prove his power, it came with his title, but the downside to that is that he hadn't necessarily made the public fear him (kind of Machiavelli-style).
I guess I'm just wondering how differently Napoleon and Hitler interacted with the leading social groups while they were coming to power...