Decades of the New World (De orbe novo decades) by Peter Martyr is a series of letters and reports of the early explorations of Central and South America that was published beginning 1511 and later anthologized. Being among the earliest such reports, Decades are of great value in the history of geography and discovery and describe the early contacts of Europeans and Native Americans derived from the narrative of the voyages of Christopher Columbus in the Caribbean and the reports from Hernán Cortés's Mexican expedition.