Pope Liberius (310 – 24 September 366) was Pope of the Catholic Church from 17 May 352 until his death on 24 September 366. According to the "Catalogus Liberianus", he was consecrated on 22 May as the successor to Pope Julius I. Liberius is mentioned in the Greek Menology, the Eastern equivalent to the martyrologies of the Western Church and a measure of sainthood prior to the institution of the formal Western processes of canonization.