13. Candide and Martin have dinner with six men, who all have something in common. What is it?
From Quiz Voltaire's "Candide" Part IV
Answer:
They are kings
The kings are, in the order in which they talk to Candide: Achmet III, Sultan of the Ottoman Empire; Ivan VI of Russia (the dates for Ivan's birth and death in the footnote of my book do differ from this king's, but I am fairly positive that this is who is meant, for the facts about his life that Voltaire mentions correspond to Ivan VI); Charles III of England, also known as Bonnie Prince Charlie; Augustus III of Poland; Stanislaw I of Poland (who immediately preceded Augustus III); Theodore of Corsica. They have all encountered misfortunes and lost their thrones.
The other kings, upon hearing Theodore's story, all feel sorry for him and give him some sequins which he could use to buy things. Candide gives him a diamond worth two thousand sequins - the kings are aghast that this man, whom none of them know, can afford to give Theodore much more than they can. When they ask Candide if he is a king, he replies "No, sir, and I do not wish to be".
The date accuracy is off here, for Admiral Byng died in 1756, while Achmet III died twenty years before, in 1736, so there's no way that Candide and Martin could possibly have conversed with him a couple of months after witnessing Admiral Byng's execution.