Pachacuti Inca Yupanqui (often simply Pachacuti or Pachacutec) was the 9th Inca ruler (r. 1438 - 1471 CE) who founded their empire with conquests in the Cuzco Valley and beyond. Pachacuti is also credited with founding the site of Machu Picchu.
This is a companion discussion topic for the original content at https://www.worldhistory.org/Pachacuti_Inca_Yupanqui/.