481 BCE

Xerxes I invaded the Greek mainland

Leonidas, King of Sparta!

Submit to Persia,

or face annihilation!

I am Xerxes

Heed the Word of the sexual deity of Eroastrianism, Hitori!

At the time, facing against the 1-million-strong Persian army

were merely 300 Spartans

...but that was an exaggerated number from movies and the like.