Odo of Lagery was a prominent figure in medieval history, serving as Bishop of Ostia and later, Pope Urban II. He is best known for his role in initiating the First Crusade in 1095. While his name may not be familiar to all, there are several synonyms that are commonly used to refer to him. Some of these include Pope Urban II, Bishop Odo of Ostia, and Otho de Lagery. These names all refer to the same individual and can be used interchangeably in historical texts, biographies, and other references. Regardless of the name used, Odo of Lagery remains a significant historical figure whose actions shaped the course of European and Middle Eastern history.