In his Historia general y natural de las Indias (1535, expanded in 1851 from his previously unpublished papers), Gonzalo Fernández de Oviedo y Valdés discusses the discovery of the island by his contemporary, Spanish navigator Juan de Cabezas (also known as Juan de Grado), in 1526.J. Lines, Diario de Costa Rica, May 12, 1940 D. Lievre, Una isla desierta en el Pacífico; la isla del Coco in Los viajes de Cockburn y Lievre por Costa Rica (1962: 134) tells that the first document with the name "Isle de Coques" is a map painted on parchment, called that of Henry II, that appeared in 1542 during the reign of Francis I of France. The planisphere of Nicolas Desliens (1556, Dieppe) places this Ysle de Coques about one and a half degrees north of the Equator.
