This guy, Count Montgaillard, seems to have switched allegiances as often as he used to breath - he was an aristocrat and en emigre who then served the Republic, the Bourbon princes, again the Diectory, Napoleon, and again the Bourbons. (And to be sure he was not a tecnhocrat but rather a political adviser, a profession that does not usually enable one to change employers in such a way). However, all things come to an end ans wikipedia informs us that:
His career ended after the July Revolution, and he died in obscurity at Chaillot.
I wonder why? Did he get too old to perform the allegiance switch trick one more time? Did he genuinely tire of politics (not likely, null hypothesis)? Was he compromised in the eyes of the new regime by some special bad turn he had done them? Something else I am missing?