At the heart of the Aztec Empire was the "Triple Alliance" of the cities of Tenochtitlán, Tetzcoco and Tlacopa who, around A.D. 1428, agreed to work together to grow their influence and share the ...

The Triple Alliance was created with the lords of Texcoco - situated on the eastern shores of Lake Texococo - and Tlacopan - sometimes referred to as Tacuba, situated on the western shores of Lake ...