Leo of Ostia

Leo marsicanus (that is, " Leo from Marsi " ), Leo Ostiensis (that is, " Leo of Ostia " ) or Leone dei Conti di Marsi (* 1046 in Marsican, † May 22 1115 in Ostia), was a nobleman and cardinal. He entered 1060/3 in Monte Cassino, where he worked as a librarian and historian.

In Monte Cassino he came into contact with Desiderius of Benevento, who later became Pope Victor III. , To whom he also dedicated his most important work as a historian, the Chronicon monasterii Casinensis. The chronicle is largely based on the earlier work of Amatus but also on oral tradition and archive material. Leo finished his work 1075th Peter the Deacon continued the chronicle. The Chronicle reports on the history of the monastery and provides information on the history of Italy, the emperors and popes.

Pope Urban II made a cardinal deacon Leo 1088 by Santi Vito, Modesto e Crescenzia. Between 1102 and 1107 Pope Paschal II appointed him Cardinal Bishop of Ostia and Velletri, a post which he held until his death. 1111 he participated at the first resistance against the Cardinals Paschal II

Works (selection)

• Chronicon Casinense ( to III 33; ed. H. Hoffmann, MGH SS 34, 1980).
• Narratio de consecratione ecclesiae Casinensis ( preliminary studies for Chronicon )
• Breviatio de monasterio see Sophiae ( preliminary studies for Chronicon )
• Translatio s Mennatis I, II
• Different tract acts uncertain assignment: De signis, Sermones de pasca, De Nativitate,