Knight of Elvas 
A Narrative of the expedition of Hernando de Soto into Florida published at Evora in 1557 [EPUB ebook] 

A Narrative of the expedition of Hernando de Soto is about Spanish explorer and conquistador de Soto who was involved in expeditions in Nicaragua and the Yucatan Peninsula. He played an important role in Francisco Pizarro’s conquest of the Inca Empire in Peru but is best known for leading the first European expedition deep into the territory of the modern-day United States (through Florida, Georgia, Alabama, Mississippi, and most likely Arkansas).