Built between 421 and 406 BC, the Erechtheion is situated on the most sacred site of the Acropolis. It is said to be where Poseidon left his trident marks in a rock, and Athena's olive tree sprouted, in their battle for possession of the city. Named after Erechtheus, one of the mythical kings of Athens, the temple was a sanctuary to both Athena Polias, and Erechtheus-Poseidon.
