Reincarnated old hag can’t leave things alone! - second life of a former unscrupulous empress-

Lauris El Danus ruled the empire with a reign of terror, and her life ended as she lost to a hero. Or so she thought. Three hundred years later, she has resurrected looking like a girl, but an old hag-former empress at heart! It seems that God has given her a chance to start over her life to honor her sacrifice to bring the world peace. She hopes her second life could be peace and quiet. No matter what era you are in, bad people always exist. A refreshing fantasy of the fearsome girl that can't let bad things go!

(Source: Alpha Manga)