Moctezuma II
Moctezuma II instituted more imperial reforms. After the death of Nezahualcoyotl, the Mexica Emperors had become the "de facto" rulers of the alliance. Moctezuma II used his reign to attempt to consolidate power more closely with the Mexica Emperor. He removed many of Ahuitzotl's advisors and had several of them executed. He also abolished the "quauhpilli" class, destroying the chance for commoners to advance to the nobility. His reform efforts were cut short by the Spanish Conquest in 1519.