Bernal DΙ´az del Castillo (1496–1584), The Memoirs of the Conquistador Bernal Diaz del Castillo: Written by Himself Containing a True and Full Account of the Discovery and Conquest of Mexico and New Spain

Bernal Díaz del Castillo was a Spanish soldier who took part in the Spanish conquest of Mexico and wrote an eyewitness account of these events much later in his life. His account of the conquest is rich in details and offers interesting perspectives on the horror that the Spaniards felt when they encountered the indigenous Mexican practice of human sacrifice (a practice that would be used to justify the conquest) and the emotions that were displayed in relations between Spaniards and indigenous Mexicans. Of course, his account offers a Spanish/European point of view and, unsurprisingly, needs to be treated with due caution as a source.