<P> In 1438 AD , under the command of Sapa Inca ( paramount leader ) Pachacuti , whose name meant `` world - shaker '' , they began a far - reaching expansion . The land Pachacuti conquered was about the size of the Thirteen Colonies of the United States in 1776 , and consisted of about half the Andes mountain range . </P>
who was the inca king who began the conquest that led to the creation of their empire
Pachacuti