After participating with Francisco Pizarro in the conquest of Peru in 1535, Orellana moved to Guayaquil and was named governor of that area in 1538. When Pizarro's half brother, Gonzalo, prepared an expedition to explore the regions east of Quito, Orellana was appointed his lieutenant. In April 1541 he was sent ahead of the main party to seek provisions, taking a brigantine with 50 soldiers. He reached the junction of the Napo and Marañón rivers, where his group persuaded him of the impossibility of returning to Pizarro. Instead, he entered upon an exploration of the Amazon system. Drifting with the...