The project was previously being referred to as 300: Battle of Artemisia. However, according to a new report, the title has been altered slightly to 300: The Battle of Artemisium.
The Battle of Artemisium took place concurrently with the Battle of Thermopylae – which was portrayed in 300. “Artemisia”, in this case, refers to the name of a woman who essentially leads Xerxes to his doom.
Xerxes (Rodrigo Santoro) is somewhat pushed into the bloody battle with the Greeks by the gold-covered maven goddess Artemisia. Artemisia, witnessing just how much his father King Darius’s death has affected him, persuades Xerxes – with her “vindictive charm” – to go into battle against those responsible.
Artemisia tells Xerxes that he has no choice but to avenge his father’s death and has to man up before becoming king. So, he sets off to become a God because that’s the only way he can win the battle.
Artemisia, on her hunt for a group of men to join Xerxes in the battle against the Greeks, doesn’t stop at brainwashing Xerxes. She also manages to convince Themistocles [the part Joel Edgerton is in talks for] to side with her somewhat. Though the Persians took his family, and he’s spent ten years training the Greeks for battle, Artemisia has such an allure about her that the muscly Greek is taken. Ultimately, she convinces him that his life will be better off if he swaps sides. But this guy’s also as good a liar as he is a fighter.