Another way to distinguish them besides using Roman numerals is that Moctezuma I was Moctezuma Ilhuicamina and Moctezuma II was Moctezuma Xocoyotzin. The first means "lone who shoots an arrow into the sky". Xocoyotzin simply means "the youngest".
Moctezuma II, heir of Auitzotl, was the Aztec ruler of the city of Tenochtitlan who increased the power of Tenochtitlan to utterly dominate its sister cities of Texcoco and Tlatelolco. Legend has it that there were eight signs in the ten years prior to the arrival of the Spanish conquistadors, signalling the collapse of the Aztec empire. These were:
In the spring of 1519, he received the first reports of aliens landing on the east coast of his empire. On November 8, 1519, he met Cortés, whom he believed to be the god Quetzalcoatl.
During Cortes's absence, the deputy governor decreed that the Aztec ritual of human sacrifice must stop. The people rose up in revolt, and the Spanish seized Moctezuma as a captive. On July 1, 1520, in an effort to assuage the raging mob, Moctezuma appeared on the balcony of his palace, appealing to his countrymen to retreat. The people were appalled by their emperor's complicity with the Spanish and pelted him with rocks and darts. He died a short time after the attack. Moctezuma was then succeeded by Cuitlahuac and Cuauhtemoc. By the following year, the Aztec empire had entirely succumbed to the Spanish.
wikipedia.org dumped 2003-03-17 with terodump