Andrés de Olmos (c.1485 – 8 October 1571) was a Spanish Franciscan priest and grammarian and ethno-historian of Mexico's indigenous languages and peoples. He was born in Oña, Burgos, Spain and died in Tampico in New Spain (modern-day Tampico, Tamaulipas, Mexico). He is best known for his grammar, the first in the New World, of the Classical Nahuatl language. Source: Wikipedia (en)