Pizarro, Juan hwän pēthär´rō [key], d. 1536, Spanish conquistador, brother of Francisco Pizarro . He aided Francisco in the conquest of Peru. With his other brothers, Gonzalo and Hernando, he fought against the Inca Manco Capac during the siege of Cuzco in 1536. He was killed leading an attack on the Native American fortress Sacsahuamán .
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