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In science fiction, Robert Heinlein's novel Time for the Stars depicts its protagonists returning to Earth after a galactic voyage lasting several centuries, and landing at Rio de Janeiro, where they are greeted by "Emperor Dom Pedro III", who presents them with a medal on behalf of the World Government.
Later explorations of the theme of the superhuman and of the incompatibility of the normal with the supernormal occurs in the works of Stanisław Lem, Frank Herbert, Wilmar Shiras, Robert Heinlein and Vernor Vinge, among others.
The plot is markedly similar to that of Robert Heinlein's Citizen of the Galaxy, including its essentially identical setup of a young slave boy—who is really the lost heir of a powerful family—being bought for a pittance by a seeming beggar, who is himself really a spy, and who suspects the boy's true identity.