Hera
Though best known as Zeus' wife (and sister), Hera was certainly a powerful Goddess in her own right. She was the Queen of Heaven, and she ruled over marriage, motherhood, children, the cycles of a woman's life, and all affairs of the household. Considering her rocky relationship with Zeus and his frequent paramours, it's no surprise that Hera was also called upon by women who also suffered from the infidelities of their husbands.
Though Zeus wandered frequently, Hera always stood by him as her husband. Her vengeance was usually reserved for those other women rather than for Zeus himself, or any children that were born from his trysts. Because of this, Hera is viewed as a stern, jealous and angry woman. But in reality, she truly loved Zeus.
Animals sacred to Hera were the peacock (for its beauty and luxury) and the cow (for its fertility). She was worshipped all through ancient Greece, but her main temple was at Paestum (south of the modern city of Naples). Childless couples came to the temple and made love there, in hopes that Hera would help them conceive a child.
In the Roman pantheon, Hera is known as Juno.
