Cyrus and Darius - Is That the Epithet the Great?

Two persian rulers have hearn the epithet the great, and that's cyrus and darius. Can you just tell us a little bit about these two mennd, and why they deserve that title? I i think they do. You know, i'm not very cavalier in using things like the great, very but i think cyrus certainly deserves it. He went from taking iran from being basically a tribal federation to the beginning of of imperialism. It was quite astonishing, really.