... like he did with the queen in 300.I mean she was bearly in the book ... http://en.wikipedia.org/wiki/Gorgo%2C_Queen_of_Sparta
She is mentioned by name at least thrice in Herodotus (Histories) and at least once by Plutarch. Herodotus mentions her twice in the context of political interactions where she is present at court or in council and gives advice to the king or the elders. This either indicates that Gorgo was highly thought of by Herodotus who often left out the names of the female figures he included in his books, or that as the wife of Leonidas I, her actions and counsel were all the more noteworthy.
Plutarch quotes Queen Gorgo as follows: "When asked by a woman from Attica, 'Why are you Spartan women the only ones who can rule men?', she said: 'Because we are also the only ones who give birth to men.'" Another version has this as, "...some foreign lady, as it would seem, told her that the women of Lacedaemon were the only women in the world who could rule men; 'With good reason,' she said, 'for we are the only women who bring forth men.'" (Plutarch's Lives: Lycurgus)
She had an important role according to the historians. I guess Miller left her out to concentrate on the Battle. I haven't read 300, btw.
Actually, if he left her out, I am surprised. Miller usually features kick-arse women figures.