Pope John XI (Latin: Ioannes XI) was Pope from March 931 (at the age of 20) to his death in December 935.
His mother Marozia was the de facto Roman ruler at the time, resulting in his appointment to the Papacy. Marozia was thus allegedly able to exert complete control over the Pope.
At the overthrow of Marozia around 932, John XI reportedly became subject to the control of Alberic II, his younger brother. The only control left to the Pope was the exercise of his purely spiritual duties. All other jurisdiction was exercised through Alberic II. This was not only the case in secular, but also in ecclesiastical affairs.
It was at the insistence of Alberic II that the pallium was given to Theophylactus, Patriarch of Constantinople (935), and also to Artold, Archbishop of Reims (933). It was 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.