The Mysterious Cities of Gold, originally released in Japan as Esteban, Child of the Sun and released in France and Luxembourg as Les Mystérieuses Cités d'Or, is an animated series which was co-produced by DiC Audiovisuel and Studio Pierrot.

Francisco Pizarro, Marquess of the Atabillos was a Spanish conquistador, best known for his expeditions that led to the Spanish conquest of the Inca Empire.