Final answer:
Atahualpa was the ruler of the Inca when Francisco Pizarro arrived, and his capture and execution marked the end of the Inca Empire.
Step-by-step explanation:
The ruler of the Inca when Francisco Pizarro arrived was Atahualpa. He was the last Sapa Inca (emperor) of the Inca Empire before it was conquered by the Spanish. Atahualpa was captured by Pizarro and eventually executed, leading to the downfall of the Inca Empire.
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