From bishop to turn miller.
More French Proverbs:
He lies like a toothdrawer.French
Princes use men as the husbandman uses bees.
French
Save a thief from the gallows and he will cut your throat.
French
The word of honour of a gentleman--another pledge would be better.
French
Who refuses, muses.
French
There's nothing like having the key of the fields.
French