Hebe

Hebe is the goddess of youth, daughter of Zeus and Hera.

History
Hebe is one of Zeus and Hera's children. She is the goddess of youth and performed the job of cupbearer to the gods, acting jointly with Ganymede. She is given to Heracles (Roman Hercules) as his wife when he asends to Olympus.

When Hercules became a god and came up to Mount Olympus, he and Hebe were married. Hera did this as a peace offering to him, though she had cursed his mortal life. One suggessted reason for this is he saved her from being raped during an uprising of giants known as the Gigantomachy.

Hebe granted lolaus' wish to become young again in order to fight Eurystheus, showing herself to be generous and kind.

Hebe had two children with her husband Heracles: Alexiares and Anicetus.

The Titan's Curse
Hebe doesn't appear in the series, but she was probably on Olympus when Percy, Annabeth, and Grover visited there.

The Last Olympian
Annabeth mentions that William H. Seward (a statue in NYC at that time) is a governor of New York is a son of Hebe earlier on in the book and at the end of the book her cabin was in the process of being built.