In the 490s, he starts going after the Athenians. This is the beginning of the Greco-Persian Wars. He is unsuccessful. He dies in the 480s, and then his son, this is actually a relief of Darius the Great right over here from Persepolis, and then his son continues to try to take over in the second Greco-Persian Wars, and he too is unsuccessful. But it's worth noting, a lot of this history that we get, especially of Cyrus the Great and the early Persian shanshas, the history we get is from the Greeks. So it's worth taking it with a grain of salt because as you can see, they were rivals. And to say rivals is a little bit unfair to the Persians because the Greeks were more of a thorn in the side of a large empire.