What is the role of Cyrus in the formation of the Persian state? Why did his contemporaries call him great?

Cyrus the Great at one time was able to create a huge state on the territory of the ancient east, as well as become the ancestor of the Achaemenid dynasty, which ruled the Persian Empire for several hundred years. The period of reign of Cyrus 2 falls on 559-530 BC. During this period of time, he was able to significantly expand the borders of the state by conquering other lands.