Pachacuti Inca Yupanqui was also known Pachacutec. Pachacuti was the one who transformed a small Inca kingdom into the famous empire, Tawantinsuyu. He was the ninth Inca Emperor (1438-71 ). He was the fourth Emperor of the Hanan dynasty.
Cusco attacked !
Pachacuti was not supposed to be Inca Emperor. His brothr Urco was the crwon prince. Urco should be the Inca after Inca Virachocha. But then one of the most important incident change the course of history in South America. Chancas, one of the famous enemy of Inca attacked Cusco. According to many chroniclers, Viracocha and Urco both left Cusco without fighting the Chancas. Pachacitu Cusi Yupanqui defended the city and defeated the enemy. So after this war he became the crown prince and afterwards he became Inca after Virachocha.
Once he became Inca he started to win surrounding area. He followed a good technique. He sent his people to the neighboring area with the message , surrender and be part of Inca empire. Those who did not obey the message he went for a battle and and captured the new areas. Afterwards his kingdom was expanded and became the most powerful Empire in South America. Afterwards Tupac Yupanqui (Pachacuti's son and successor) won lot of battle during his regime. During the regime of Pachacuti, the empire extended upto Chile toward South and up to Ecuador toward the north.
Machu Picchu- established by Pachacuti ?
When ruins at Machu Picchu was discovered, initially Hiram Bingham thought it was the Vilcabamba, the last capital of Inca. Afterwards it was proved that Machu Picchu was not Vialcamaba, rather it was just a place unknown to Spaniards. Earlier it was not clear why this city was built and abandoned. But now many archeologists came up with proofs that it was built during the time of Pachacuti.