Pope Hilarius (also Hilarus, Hilary; died 29 February 468) was the bishop of Rome from 461 to 468. In 449, Hilarius served as a legate for Pope Leo I at the Second Council of Ephesus. His opposition to the condemnation of Flavian of Constantinople incurred the enmity of Dioscurus of Alexandria, who attempted to prevent him from leaving the city. Hilarius was able to make his escape and returned to Rome by an indirect route. He later erected an oratory at the Lateran in honor of John the Evangelist, to whom he attributed his safe passage. Much of his pontificate was spent in maintaining ecclesiastical discipline in conformity with canon law, and in settling jurisdictional disputes among the bishops of both Gaul and Spain.