Catherine de Medici

Queen consort of France from 1547-1559 as the wife of King Henry II. She had basicaly no role as queen under her husbands reign. However, when  he died, she oversaw and basically ruled while her three sons took the throne. After her first son took the throne, she ruled by giving him all the answers. Her first ruling: She made her husbands mistress Diane de Poitiers give back the crown jewels and the manor house that were gifted to her by Catherines adulterous husband. She spent the following years while her sons intermittently took the throne (her first son passed, then her second son passed both passing the throne to the next brother in line) outdoing and undermining Diane de Poitiers while ruling behind all three of her sons. A truly badass woman.