not sure how 300 hasn't earned it's own section in the FAQ by now, but a search turned up this bunch of previous posts

How historically accurate is the film 300?

How accurate is 300 to real history?

How accurate is the movie 300?

Recently, I watched 300. The one thing I didn't like was the portrayal of the Persians as slave-owning tyrants.

A rather simple question about the Battle of Thermopylae...

Battle for Thermopylae vs 300: The Movie

During ancient Greek/Roman times, would the soldiers and warriors be as ripped and buff as they are portrayed in the movies?