125th Pope of the Catholic Church. Pontificate 931 - 935. His mother was the 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.