La Noche Triste ("The Night of Sorrows") on June 30, 1520, was an important event during the Spanish conquest of Mexico, wherein Hernán Cortés and his army of Spanish conquistadors and native allies fought their way out of the Mexican capital at Tenochtitlan following the death of the Aztec king Moctezuma II, whom the Spaniards had been holding as a hostage.
Cuitláhuac, 10th tlatoani of the Aztec Empire, brother of Moctezuma II. After being held captive by the Aztecs, Cortés ordered Moctezuma to ask his people stop fighting. Moctezuma told him that they wouldn't listen to him, and in turn asked him to free his brother Cuitláhuac so he'd convince the people to stop. Once freed, Cuitláhuac led his people against the conquistadors and successfully drove them out of Tenochtitlán on June 30, 1520. After ruling for only 80 days, he died of smallpox.
Moctezuma II (c. 1466 – 29 June 1520), also known by a number of variant spellings including Montezuma, Moteuczoma, Motecuhzoma and referred to in full by early Nahuatl texts as Motecuhzoma Xocoyotzin (Moctezuma the Young),[N.B. 1] was the ninth tlatoani or ruler of Tenochtitlan, reigning from 1502 to 1520.