A lot of people are interested in the second Persian expedition to Athens, and in the ethics of that expedition. For some people today, it is about freedom and slavery. For others, it is a clash between two races or nations to determine which is stronger and will absorb the loser. But when the ancients thought about the rights and wrongs of that war, they brought up some other aspects. Lets have a look at the famous story about the Persian heralds who came to Greece to ask the cities to submit to the King’s authority by giving him earth and water.
The Internet loves the image of the tough Spartans throwing Persian emissaries into a pit rather than give them what they had asked for (it makes a great meme). But the ancients knew that this was against the laws of gods and men. So Herodotus spends one sentence on the crime, then five paragraphs on the punishment which befel the Spartans and the Athenians for their crime.