Darius the Great's punitive expedition.
It was an expeditionary force sent by King Darius.
An Persian expeditionary force sent by King Darius to punish the Eretrians and Athenians for interfering in his empire was defeated at the Battle of Marathon in 490 BCE.
Persia had a king, not an emperor. The Persian king Darius I was at home in Persia when the battle of Marathon took place, so he was not killed at Marathon. Darius the Great died of natural causes 14 years after Marathon.
It was Athens against Persia. Athens helped Miletus (another city-state) in a battle against Persia. Athenians didn't actually fight, they just helped Miletus by giving them ships and weapons. Miletus lost against Persia and when Persia discovered that Athens had helped Miletus they wanted the Athenians killed. Thus the battle of Marathon began.
Darius was the third king of the Persian Empire and the father of Xerxes I (the king of Persia mentioned in 300). He was the first Persian to attempt to invade Greece and was ultimately defeated at the Battle of Marathon in 490 BC.
Datis and Artaphernes.
The batte of Marathon was between the Athenian people or Athens and the greatest empire of that time Persia.
They were defending their city from an attempt by Persia to instal an expelled Athenian tyrant to rule them.
King Philip did not conquer Persia because he was assassinated.
In 490 BC the Persion King Darius invaded Greece. He had planned to invade Greece and take over Athens, however; he lost at the battle of Marathon.
He was in his palace at Persepolis in Persia, governing his empire.
The Battle of Marathon, August/September 490 BC, gave Greece a victory over Persia.