The Memoirs of the Conquistador Bernal Diaz del Castillois a first-person narrative by military adventurer, conquistador, and colonist settler who served in three Mexican expeditions; those of Francisco Hernández de Córdoba (1517) to the Yucatán peninsula; the expedition of Juan de Grijalva (1518), and the expedition of Hernán Cortés (1519) in the Valley of Mexico; the history relates his participation in the fall of Emperor Moctezuma II, and the subsequent defeat of the Aztec Empire.