Etienne IX (Frederic), Lorraine prince, pope of August 3rd 1057 at March 29th 1058. Wire of Gothelon Ier, it comes from the family of the dukes of Lorraine and is also the brother of Godefroi II Bearded the, the duke of Toscane. Before being pope, he was a Benedictine and a former abbot of the Mount-Cassin. He was indicated pope without the downstream of the emperor. After 8 months of pontificate, he died assassinated in Florence because he was opposed to the nomination of the popes by the Germanic emperor. Part of the Roman aristocracy chooses then the Antipape Benoît X.