This man's death and physical attributes were described in the most well-known historical work by Bernal Diaz del Castillo. This man was described as an indecisive, vain ruler in primary sources, such as Bernardino de Sahagun's Florentine Codex. Shortly after this man's death, his people assassinated the rearguard of an invading force in the Night of Sorrows massacre. This emperor welcomed the forces of a conquistador after mistaking him for the returning god Quetzalcoatl. For 10 points, name this emperor of the Aztec Empire when it was conquered by Hernan Cortés.
a) Moctezuma II
b) Cuauhtémoc
c) Montezuma I
d) Itzcoatl