Map shows South America, part or North America, part of Australia as "Nouvelle Hollande," New Zealand, and islands of the Pacific Ocean, an uncharted Antarctic Pole, and major cities. Insets: "Sphère oblique" and "Pour la latitude." Scale varies.

Grétry’s Le Huron takes as its source a short story called L’ingénu (Geneva, 1767), written by Voltaire under the name Dulaurens. The story was banned two months after its publication due to anti-government themes. For instance, the young man raised by the Hurons (the title character of the opera) was imprisoned for expressing his radical ideas about issues such as the treatment of the Huguenots. Voltaire’s character is derived from another source, the novel Bélisaire by Marmontel, in which a man is framed for a crime and awaiting the death penalty before being released. Marmontel, who corresponded regularly with Voltaire, created the libretto for Grétry’s opera. However, most controversial aspects of the story were eliminated or downplayed for the censors, and as a result, the anti-religious message is absent from Le Huron.