Who was Hera?

The mighty Zeus, king of all the gods, had three sisters. Demeter was the goddess of the crops. Hestia was the goddess of hearth and home. And Hera was the goddess of marriage. She was married to Zeus, even though he was her brother. That made Hera the queen of all the gods. Hera and Zeus had two kids - Ares, the god of war, and Hephaestus, the god of fire. But Zeus had kids by other mothers including Apollo, Artemis, Hermes, and Hercules. Hera was very jealous of these children and their mothers. If she could hurt them, she did. Hera was smart, and devious, and downright evil sometimes. She tried to kill Hercules. Zeus spent a great deal of time protecting his children from Hera's wrath.

Zeus, Hera, and Little Io

Hercules & the 12 Labors of Hercules