Cyrus the Great. He was Cyrus the Second, but he became Cyrus the Great because he's able to break out and overthrow the Medians and establish this massive empire and the reason why it's called the Achaemenid Empire, not the Cyrid Empire, is that Cyrus claims to be from the family of the patriarch Achaemenes and a lot of these names, these are from Greek accounts and so that's why they sound a little bit more Greek, but Achaemenes is a semi-legendary figure that we're not sure exactly when he lived, but the best accounts I could see is near the beginning of the 7th century BCE and Cyrus the Great is from Achaemenes' family and so since they came to power, this first really Persian Empire, when the people talk about the Persian Empire, they don't tend to refer to the Median Empire, they're really referring to the Achaemenid Empire. That's why it's called Achaemenid. Now in future videos, we'll talk more about what happened in the Achaemenid Empire, but you can see the extent of it was pretty significant and it lasts for a little over 200 years until they are conquered by foreigners and the foreigners that conquer them are the Greeks. The Philip of Macedon's son, Alexander the Great, is able to on some level unify Greece and Persia and it's interesting because a lot of what we learn about ancient Persia, it's accounts from the Greeks, from folks like Herodotus, but during the time of classical Greece, Greece was really a bit of a sideshow. It was really this kind of thorn in the side of Persia. Persia was really where the power was, but as we get to the mid or the end of the fourth century BCE, Persia weakens, Greece unifies under Philip of Macedon and Alexander the Great and Alexander the Great is able to conquer the Persian Empire and he is short-lived.