Aeolus

Aeolus, is the custodian of the four winds. A minor deity, he is the son Hippotes and Melanippe, and thus the maternal grandson of Chiron. He lived on one of the rocky Lipara islands, close to Sicily (or what is now called Sicily).

History
In the heart of his floating island Aeolia were the storm spirits imprisoned, and Aeolus, directed by the higher gods, let out these winds as soft breezes out his cheeks, gales, or whatever the higher gods wished. Visited by the Greek hero Odysseus, Aeolus received him favorably and on the hero's departure presented Odysseus with a bag containing all the adverse winds, so that his friend might reach Ithaca with a fair wind. Odysseus did as Aeolus bid, but in sight of his homeland, having been untroubled by foul weather, he fell asleep and his men, curious, opened the bag, thus releasing all the fierce winds, which blew their ship far off course. When they returned to his Island Aeolus drove them off, saying they were detested by the gods. In the Odyssey, he is said to have six sons and daughters who are intermarried, and his consort Iphimedeia comes to Odysseus in the land of the dead. He and his family are said to be constantly feasting on delicacies.

The Last Olympian
Aeolus is mentioned in The Last Olympian. He sent his most powerful minions to guard Olympus. Anybody except the gods and later the pegasi who helped Percy and the demigods defending Olympus who tried to go near it from the air would be knocked out of the sky.

The Lost Hero
Aeolus appears in The Lost Hero when the characters visit his palace. He appears to have gone insane from filling in the gods weather requests. He is a little like a weather man. He also wants a promotion from Zeus to become a god, and not a 'Master of Winds'. He says that the benefits are so much better. He was the one who ordered the four seasonal winds to not help any demigod who asks for help, and to kill them. He was originally going to help Jason and his group by sending them to their next destination when a voice in his head (presumably Khione or even Gaia) convinced him not to.

Trivia

 * Chiron is his grandfather through his mother Melanippe.
 * Many mistake the winds imprisoned on his island to be the four major anemoi (Boreas -N-, Euros -E-, Notos -S- and Zephyrus -W-) and the 4 lesser anemoi (Kaikias -NE-, Apeliotes -SE-, Livas -SW- and Skiron -NW-), while the winds he has improsened are actually the venti and harpies.