They were much stronger. The Aztecs, at first, thought the arriving Spaniards were "people of Heaven". However, after the Spanish leader Cortes murdered their king and started looting all the wealth, primarily gold. Despite the Aztec's sophisticated society, they were no match for the conquistadors. Along with the Spanish conquistadors "conquerors" came missionaries, in an attempt to convert the Aztecs. Not long after the the Spanish arrived, the Aztec population was reduced to 10%. Simply put, the Aztecs were no match for the Spanish.