Pachacuti Inca Yupanqui (or Pachacutec). He was the ninth Sapa Inca (1438–1471/1472) of the Kingdom of Cusco, which he transformed into the empire Tawantinsuyu, or the Inca Empire. Most archaeologists now believe that the famous Inca site of Machu Picchu was built as an estate for Pachacuti.
In Quechua, Pachakutiq means "He who shakes the earth", and Yupanqui means "With honor". During his reign, Cuzco grew from a hamlet into an empire that could compete with, and eventually overtake, the Chimú. He began an era of conquest that, within three generations, expanded the Inca dominion from the valley of Cuzco to nearly the whole of western South America.
Pachacuti, son of Inca Viracocha, was the fourth of the Hanan dynasty. His wife's name is given as Mama Anawarkhi or Coya Anahurque. He had two sons: Amaru Yupanqui and Tupac Inca Yupanqui. Amaru, the older son, was originally chosen to be co-regent and eventual successor. Pachacuti later chose Tupac Inca because Amaru was not a warrior. He was also the first one to retire.
Pachacuti's given name was Cusi Yupanqui and he was not supposed to succeed his father Inca Viracocha who had appointed his brother Urco as crown prince.