No. The true story behind 300: Rise of an Empire reveals that Themistocles did not kill Xerxes's father, King Darius I of Persia (Darius the Great), with an arrow at the Battle of Marathon. ... It was then that Xerxes, the eldest son of Darius and Atossa, became King, ruling as Xerxes I.

Who defeats Xerxes?

In August 465 BC, Artabanus, the commander of the royal bodyguard and the most powerful official in the Persian court, assassinated Xerxes with the help of a eunuch, Aspamitres.

Who was the traitor at Thermopylae?

In the 1962 film The 300 Spartans, Ephialtes was portrayed by Kieron Moore and is depicted as a loner who worked on a goat farm near Thermopylae. He betrays the Spartans to the Persians out of greed for riches, and, it is implied, unrequited love for a Spartan girl named Ellas.