Which came first the legend of Achilles or 300 men of sparta?

Question:

Which came first the legend of Achilles or 300 men of sparta?

is the king agamemnon alive when the 300men with king leonidas protect sparta?

Best Answer - Chosen by Asker: Achilles is a character from Homer's poem The Iliad which is a few centuries older than the battle of Thermopylae which is an historical event.