Note:  Do not rely on this information. It is very old.

Marozia

Marozia, a Roman lady of noble birth but scandalous reputation, was the daughter of the notorious Theodora. She was a great power in Italy in the 10th century owing to her connection with Pope Sergius III. She procured the deposition of John X., and the election of her own son as John XI., as well as the succession of her grandsons, John XII. and Leo VII. She died in prison in 938.