Sergius III was a pope who served from 904 to 911 AD. He is often remembered for his controversial papacy, which was marked by political intrigue and conflict. His reign occurred during a tumultuous period in the history of the Papacy, characterized by power struggles among various factions in Rome. During his time as pope, Sergius III was involved in the ongoing disputes with the Byzantine Empire and faced challenges from rival factions within the city. He is also known for excommunicating his predecessor, Pope Formosus, and for the subsequent trial of Formosus's remains, known as the Cadaver Synod.