Hera

In mythology: In Greek mythology Hera was the Goddess of women and marriage as well as the queen of Olympus. She is the sister of her husband Zeus and mother of many of the Gods such as Ares and Hephaestus. She is most well known for her involvement in the Trojan War as well as giving Hercules his twelve labors for being Zeus's son.

In the book: In the book she is a very minor character only being involved in Percy's life by hating him and Annabeth. And by telling Annabeth in the Labyrinth that she has to make a big choice soon.

To learn more about Hera go to this link www.greekmythology.com/Olympians/Hera/hera.html