University of California
University of California at San Diego: Aztec Chronology
An extremely detailed chronology of the Aztecs and their predecessors, stretching from 600 AD to 1521, their conquest by the Spaniards. Scroll to the end to find a genealogical chart of the Aztec royal house.
PBS
Pbs: The Conquistadors: Aztec Life and Times
Read about what life was like for the Aztecs before the Spanish Conquest. This is part of a larger PBS site about the conquistadors.