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Which Inca emperor is believed to have owned Machu Picchu as a royal estate?

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Based on archaeological evidence and the site's construction style, Machu Picchu is believed to have been built as a royal estate or palace complex for the Inca ruler Pachacuti Inca Yupanqui, who reigned from approximately 1438 to 1471. While the exact purpose of the site remains a subject of study, both skeletal and material remains suggest it served as a royal retreat.12