Aztec Empire By travis.ainsworth 1100 The Valley of Mexico is Settled 1345 Beginning of Aztec Empire 1428 The Triple Alliance is formed between Tenochtitlan, Texcoco and Tlacopan. 1487 The Templo Mayor is completed at Tenochtitlan and inaugurated with the sacrifice of 20,000 captives. 1507 The Throne of Motecuhzoma II is carved. Also known as the Monument of Sacred War. 1519 Hernán Cortés Arrives in the Valley of Mexico 1521 End of Aztec Empire
