Moctezuma I, also known as Moteuczomatzin Ilhuicamina, Huehuemoteuczoma or Montezuma I, was the second Aztec emperor and fifth king of Tenochtitlan. During his reign, the Aztec Empire was consolidated, major expansion was undertaken, and Tenochtitlan started becoming the dominant partner of the Aztec Triple Alliance. Often mistaken for his popular descendant, Moctezuma II, Moctezuma I greatly contributed to the famed Aztec Empire that thrived until Spanish arrival, and he ruled over a period of peace from 1440 to 1453. Moctezuma brought social, economical, and political reform to strengthen Aztec rule, and Tenochtitlan benefited from relations with other cities.

Tlahtoāni is a historical title used by the dynastic rulers of āltepēmeh, autonomous political entities formed by many pre-Colombian Nahuatl-speaking peoples in the Valley of Mexico during the Postclassic Period. The title of huēyi tlahtoāni was used by the rulers of the Aztec Empire, an alliance between the āltepēmeh of Tenochtitlan, Tetzcoco, and Tlacopan.