The Battle of the Labyrinth camp for the school year. On his fifteenth birthday at the summer's end, Percy receives a visit from his father Poseidon, who gives him a sand dollar, admonishing him to “spend it wisely”. Nico later appears to tell Percy his plan to defeat Luke once and for all. "The Battle of the Labyrinth" was initially referred to as "Percy 4" until the title was officially revealed. The novel was teased by Rick Riordan behind the pages of its predecessor, "The Titan's Curse". It was based on the Greek myth of the labyrinth, where the Minotaur was supposedly kept. In his
Labyrinth four examples of labyrinths are all complex underground structures, and this appears to have been the standard Classical understanding of the word. It is also possible that the word labyrinth is derived from the Egyptian "loperohunt", meaning palace or temple by the lake. The Egyptian labyrinth near Lake Morris is described by Herodotus and Strabo. By the 4th century BC, Greek vase painters also represented the Labyrinth by the familiar "Greek key" patterns of endlessly running meanders. When the Bronze Age site at Knossos was excavated by explorer Arthur Evans, the complexity of the architecture prompted him to suggest that