It is a common belief that Marozia was the mistress of Pope Sergius III (c.860 - 14 Apr 911). The Liber Pontificalis and the works of Liutprand of Cremora state that Marozia had a child by Sergius, a son who would eventually become Pope John XI. However, the annalist Flodoard (c. 894–966), a contemporary of Liutprand, wrote that John XI was the brother of Alberic II (Alberic II being the son of Alberic I) and Horace Mann and other 19th and 20th century authors (including Poole, Gfrörer, Kenrick and others) agree that Alberic I, was John XI's father.
about 924, to Guy of Tuscany, aka Guido Toscana (d.929) They had a daughter, Berta Theodora, who never married.
in 932, to Ugo, King of Italy. It should be noted that soon after their wedding day, in Dec 932, Marozia and Hugh were stripped of their power by Marozia's son, Alberic II, who seized the castle and was proclaimed the Lord of Rome. It is said that Hugh escaped by climbing the castle wall, but Marozia was not as lucky and she was handed over to Alberico II, who had her imprisoned until her death.
In the revolt of 928, her forces overthrew Pope John X and imprisoned him at S. Angelo, where he died.
Senatrix and Patricia, de facto ruler of Rome with husband Guy after 925.
She controlled two popes, Leo VI and Stephen VII, during their reigns and caused her son to be installed as Pope John XI in 931.
Her reign was ended by a revolt started by her son, Alberic II.