such. Titular bishops often serve as auxiliary bishops, as officials in the Roman Curia, in the Patriarchal Curias of Eastern Churches, as papal diplomatic envoys (notably apostolic nuncios or apostolic delegates), or head certain missionary pre-diocesan jurisdictions (notably as apostolic vicar, which as of 2019 no longer gets a titular see). Since 1970, a coadjutor bishop (or archbishop) uses the title of the see he is assigned to, and a bishop (or archbishop) emeritus uses the title of his last residential see. Suffragan bishop A suffragan bishop leads a diocese within an ecclesiastical province other than the principal diocese, the metropolitan archdiocese. Auxiliary bishop An auxiliary bishop is a full-time assistant to a diocesan bishop. Auxiliaries are titular bishops without the right of succession, who assist the diocesan bishop in a variety of ways and are usually appointed as vicars general or episcopal vicars of the diocese in which they serve. Coadjutor bishop A coadjutor bishop is a bishop who is given almost equal authority to that of the diocesan bishop; he has special faculties and the right to succeed the incumbent diocesan bishop. The appointment of coadjutors is seen as a means of providing for continuity of church leadership. Until recent times, there was the possibility of a coadjutor bishop not having the right of succession. Bishop-prelate A bishop who holds an office that does not require episcopal ordination, notably either the Prelate of a personal prelature or a territorial prelature. Emeritus bishop When a diocesan bishop or auxiliary bishop retires, he is given the honorary title of "emeritus" of the last see he served, i.e., archbishop emeritus, bishop emeritus, or auxiliary bishop emeritus of the see. "Emeritus" is not used for a titular see, but could be used for a bishop who has transferred to a non-diocesan appointment without actually being retired. Examples: Archbishop (or Bishop) Emeritus of Place". Cardinal Luis Antonio Tagle, who was promoted as prefect for the Congregation for the Evangelization of Peoples became Archbishop Emeritus of Manila. Traditionally, bishops appointed ordinaries or auxiliaries served for life. When the rare resignation occurred, the bishop was assigned a titular see. The status of "emeritus" emerged after the Second Vatican Council when bishops were at first encouraged and then required to submit their resignations at the age of 75. On 31 October 1970, Pope Paul VI decreed that "diocesan bishops of the Latin rite who resign are