<Tr> <Th> Father </Th> <Td> Viracocha </Td> </Tr> <P> Pachacuti Inca Yupanqui or Pachakutiq Inka Yupanki (Quechua) was the ninth Sapa Inca (1438--1471 / 1472) of the Kingdom of Cusco which he transformed into the Inca Empire (Tawantinsuyu). Most archaeologists now believe that the famous Inca site of Machu Picchu was built as an estate for Pachacuti . </P> <P> In Quechua Pachakutiq means "he who overturns space and time" (though more commonly translated as "earth shaker"), and Yupanki means "with honor". During his reign, Cusco 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 Cusco to nearly the whole of western South America . </P> <P> He was the ninth ruler of the Inca state who, from ruling a simple chiefdom, came to rule a great empire, the Tawantinsuyu . Although he had not been designated as successor by his father Viracocha Inca, he led a military defense against the warlike army of Chanka while his father and his brother Urco Inca fled the manor . The victory over the Chankas made Inca Viracocha recognize him as his successor around 1438 . </P>

Who was the inca ruler who greatly expanded the inca empire under his rule
find me the text answering this question