910 BC – John XI was the son of Marozia and Alberic I of Spoleto, Count of Tusculum.
932 BC – John XI reportedly became subject to the control of Alberic II, his younger brother.
933 BC – Artold, Archbishop of Reims.
935 BC – It was at the insistence of Alberic II that the pallium was given to Theophylactus, Patriarch of Constantinople.
– John XI who sat in the Chair of Peter during what some traditional Catholic sources consider its deepest humiliation, but it was also he who granted many privileges to the Congregation of Cluny, which was later on a powerful agent of Church reform.