Bishop of Palestrina by Pope Innocent XI. He was transferred to the diocese of Tusculum (Frascati) on 8 January 1680. He was promoted to the diocese of Porto e Santa Rufina on 8 January 1680. He became Dean of the College of Cardinals and Bishop of Ostia e Velletri on 10 November 1687. Cybo participated in the papal conclaves of 1655, 1667, 1669–1670 and 1676. As Dean, he presided over the Papal conclave of 1689 and the conclave of 1691. Later life and death In 1676, Cybo was appointed Cardinal Secretary of State by Pope Innocent XI; he held the post until the death of Pope Innocent in 1689. In 1698, Cardinal Cybo held a diocesan synod at Velletri on 24 and 25 November. The constitutions of the synod were published. Cybo died on 22 July 1700 in Rome, and was buried in the Cybo Chapel of the church of Santa Maria del Popolo, which he had radically rebuilt by Carlo Fontana and Carlo Maratta to glorify the achievements of his family. References Bibliography Mussi, L. (1913). Il cardinal Alderano dei principi Cybo Malaspina. Massa 1913. External links Stumpo, Enrico (1981). "Cibo, Alderano." Dizionario Biografico degli Italiani Volume 25 (1981) 1613 births 1700 deaths 18th-century Italian cardinals Cardinal-bishops of Frascati Cardinal-bishops of Palestrina Cardinal Secretaries of State