I think NapoleonI is correct :
Joseph nicknamed "Pepe Botella" when he was King of Spain, because he was offered a great wine of Burgundy, very rare, predating the revolution . He drinked a first then a second glass and refused a third one . Then Pirgnon took the bottle, turned it upside down, spilling the wine on a vase of roses and said " Le Roi a fini de boire"
Joseph Bonaparte?
After going through 24 of the 26, I finally found the answer: Prince Józef Antoni Poniatowski. The last one I expected.
This is indeed the correct answer Sandor! Bravo ! Poniatowski's nickname was Prince Pépi (in Polish) or also Pépé (found both mentioned for him). This is why you were close with your first answer since this was the other Joseph in Napoléon's inner circle.