Naxos

Naxos is an island in Greece belonging to the Cyclades island group, and is the largest isle in said group.

History
It is where Theseus abandoned Ariadne after she guided him through the Labyrinth. Dinoysus, who was the protector of the island, met Ariadne, and fell in love with her. But eventually Ariadne, unable to bear her separation from Theseus, either killed herself or ascended to heaven (depending on the myth).

Naxos, the nymph of Naxos island was one of the 50 Menae, making her a daughter of Selene and Endymion.

The island was also said to be the home of Otus and Ephialtes. The two giants who were sons of Iphimedia, the queen of Aloeus by Poseidon, the god of the seas. Both giants wanted to storm Olympus to gain Artemis for Otus and Hera for Ephialtes. They also managed to capture Ares in a bronze pithos for 13 months.

In order to free her half brother, Artemis offered herself to Otus, making Ephialtes envious, which resulted in a fight between the brothers. Artemis turned herself into a doe and jumped between them, the brothers, not wanting her to get away threw their spears and killed each other simultaneously. Although sometimes they were said to be killed by Apollo or chained to columns by snakes in the Underworld.

Both of them were seen as bringers of civilization, founding cities and teaching humanity about culture. They were venerated in both Naxos and Ascra, two cities they had founded. Ephialtes was sometimes seen as the spirit of nightmares whose name can also be translated as nightmare.

The Titan's Curse
Dionysus mentions the island while telling Percy about his wife, Ariadne.