Pope Stephen VIII was appointed by the ruler of Rome Alberic II of Spoleto. Unlike previous Popes,who did whatever Alberic wanted,Stephen’s relationship with him was a little more strained. Alberic and King of Italy Hugh were constantly quarreling and word soon got to Alberic that the new Pope was actually in league with King Hugh in a plot to overthrow Alberic. Pope Stephen and his cohorts(Bishops)were arrested,tortured and imprisoned for the rest of their lives(which wasn’t very long after).
Stephen’s only other notable action while he was Pope was helping King Louis IV of France put down a rebellion by threatening excommunication to all rebels if they did not back down(which they promptly did).