In the Catholic Church, a bishop is an ordained minister who holds the fullness of the sacrament of holy orders and is responsible for teaching doctrine, governing Catholics in his jurisdiction, sanctifying the world and representing the Church. Catholics trace the origins of the office of bishop to the apostles, who it is believed were endowed with a special charism and office by the Holy Spirit at Pentecost. Catholics believe this special charism and office has been transmitted through an unbroken succession of bishops by the laying on of hands in the sacrament of holy orders. Diocesan bishops—known as eparchial bishops in the Eastern Catholic Churches—are assigned to govern local regions within the Catholic Church known as dioceses in the Latin Church and eparchies in the Eastern Churches. Bishops are collectively known as the College of Bishops and can hold such additional titles as archbishop, cardinal, patriarch, or pope. As of 2020, there were approximately 5,600 living bishops total in the Latin and Eastern churches of the Catholic Church. Bishops are always men. In addition, canon 180 of the Code of Canons of the Eastern Churches requires that a candidate for the Eastern episcopacy should (canon 378 § 1 of the 1983 Code of Canon Law states almost the same requirements): demonstrate solid faith, good morals, piety, zeal for souls and prudence; enjoy a good reputation; not be bound by a matrimonial bond; be at least thirty-five years old; ordained a presbyter for at least five years; possess a doctorate or licentiate in some sacred science or at least be an expert in it. Diocesan or eparchial bishops The traditional role of a bishop is to act as head of a diocese or eparchy. Dioceses vary considerably in geographical size and population. A wide variety of dioceses around the Mediterranean Sea which received the Christian faith early are rather compact in size, while those in areas more recently evangelized, as in some parts of Sub-Saharan Africa, South America and the Far East, tend to be much larger and more populous. Within his own diocese a Latin Church bishop may use pontifical vestments and regalia, but may not do so in another diocese without, at least, the presumed consent of the appropriate ordinary. Appointment See: Appointment of Catholic bishops Resignation at 75 Since the Second Vatican Council of 1965 diocesan bishops and their equals "who have become less capable of fulfilling