Shammuramat

Shammuramat was a wife of King Shamshi-Adad V and after he died in 811 BC, she ruled the Neo-Assyrian Empire as its regent for five years until her son Adad-nirari III came of age. She ruled at a time of political uncertainty, which is one of the possible explanations for why Assyrians may have accepted her rule (as normally a woman as ruler would have been unthinkable).