استفان نهم

Stephen IX, also known as Stephanus IX, was a male Catholic priest and Pope born in the Duchy of Lorraine. The son of Gothelo I, Duke of Lorraine, he was educated at the Abbey of Monte Cassino and belonged to the Benedictines. He held the position of cardinal-deacon and worked in Rome and the Papal States. His siblings were Godfrey III, Duke of Lower Lorraine, and Gothelo II of Lower Lorraine.

He died in Florence on March 29, 1058, and was consecrated by Humbert of Silva Candida. Stephen IX is recognized as a saint, with his feast day observed on March 29. He is buried at Santa Reparata in Florence. His life and role are described in sources such as the Allgemeine Deutsche Biographie, the Brockhaus and Efron Encyclopedic Dictionary, and The Nuttall Encyclopædia. He is also included in the Popes collection.