Minos the bull to Poseidon, but then decided to substitute a different bull. In rage, Poseidon cursed Pasiphaë, Minos' wife, with a mad passion for the bull. Daedalus built her a wooden cow, which she hid inside. The bull mated with the wooden cow and Pasiphaë was impregnated by the bull, giving birth to a horrible monster, again named Asterius, the Minotaur, half man half bull. Daedalus then built a complicated "chamber that with its tangled windings perplexed the outward way" called the Labyrinth, and Minos put the Minotaur in it. To make sure no one would ever know the secret
The Battle of the Labyrinth book opens with Percy Jackson attending freshman orientation at Goode High School, where he sees Rachel Elizabeth Dare, a clear-sighted mortal who helps him fight two empousai and escape. Percy travels to Camp Half-Blood, where he learns Grover is in trouble with the Council of Cloven Elders for not having found Pan. During a competition organized by the new sword instructor Quintus, Annabeth and Percy accidentally find an entrance into the Labyrinth, which presents a possible invasion route for Luke. Annabeth is given leadership of a quest to find Daedalus and convince the inventor not to give Luke Ariadne's string.