When was Hera - Marvel Comics created?

There's no character named "Hera" in Marvel Comics. It's possible you're thinking of:

* Hera (Greek Mythology): She's the Greek goddess of marriage, women, childbirth, and family. She's not a character in Marvel Comics.

* Her (Marvel Comics): This character is a powerful alien queen who appeared in the 1990s. She is the leader of the Brood, a race of parasitic aliens. She first appeared in "Uncanny X-Men #168" in 1983.

Please clarify your question, and I'll be happy to assist you.