A diocesan bishop, within various religious denominations, is a bishop (or archbishop) in pastoral charge of a(n arch)diocese (his (arch)bishopric), as opposed to a titular bishop or archbishop, whose see is only nominal, not pastoral. In relation to other bishops, a diocesan bishop may be a suffragan, a metropolitan (if he is an archbishop) or a primate, and may also hold various positions such as cardinal or patriarch. Titular (arch)bishops, on the other hand, may be assistant bishops, coadjutor bishops, auxiliary bishops, nuncios or similar papal diplomats, officials of the Roman Curia, etc.