As far as I know there was no ..."pension" (lol) empire that any greek leader conquered. In case you meant Persian Empire, it was Alexander the great who conquered it.
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Who was the leader of the Spanish army that conquered the Inca Empire? Francisco Pizarro in 1535 Who conquered the Aztec empire? Herman Cortes conquered the Aztecs in 1519.
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The Spanish, led by Pizarro attempted, but never fully conquered the Inca.
One thing that led to the decline of the Aztec Empire was the shortage of skilled farmers. Mistreating the people they conquered. Additionally, the Spanish Conquistadors ripped the empire apart, destroyed the Aztec Army, killed Moctezuma (the Aztec Leader), and colonized the entire region.