Pedro Teixeira was a 17th century Portuguese explorer commissioned by the governor of Maranhão to explore the Amazon in 1637. In 1638, he became the first European to travel up the river, reaching Quito by way of the Rio Napo. He returned down the river, bringing with him the two Jesuit preists Cristóbal de Acuña, who wrote a chronicle of the exploration, and Artieda, both having been delegated by the viceroy of Peru to accompany him.