Alberic II was ruler of Rome from 932 to 954, after deposing his mother Marozia and stepfather, King Hugh of Italy. Marozia also known as Mariuccia, given the titles senatrix (senatoress) and patricia of Rome by Pope John X, was born about 890, and died, imprisoned by her son Alberico II, duke of Spoleto, between 932 and 937. ...

He was the son of the notorious Marozia by her first husband, Alberic I, Duke of Spoleto. His half-brother was Pope John XI. At the wedding of his mother to King Hugh of Italy, Alberic and his new stepfather quarreled violently after Hugh slapped Alberic for clumsiness. Infuriated by this and perhaps motivated by rumors that Hugh intended to have him blinded, Alberic left the festivities and incited a Roman mob to revolt against Hugh. In December 932 Hugh fled the city, Marozia was cast into prison, and Alberic took control of Rome. In 936 Alberic married his stepsister Alda, the daughter of King Hugh, and had a son with her, Octavian. On his deathbed he nominated his son as Pope. John XI (910?–936) was a pope from 931 to 936. ... John XII (born circa 937, died May 14, 964), was Pope from 955 to 964, was the son of Alberic II, whom he succeeded as patrician of Rome in 954, being then only eighteen years of age. ...

Sources

• Lexikon des Mittelalters
• Williams, George. Papal Genealogy: The Families and Descendants of the Popes, 1998