he may celebrate the sacraments if the local bishop or pastor judges that the visiting priest is a person of good character. In the East an antimension signed by the bishop is kept on the altar partly as a reminder of whose altar it is and under whose omophorion the priest at a local parish is serving. For priests to validly celebrate the sacrament of Penance they must have faculties (permission and authority) from the local bishop; however when the penitent is in danger of death, a priest has both the right and obligation to hear the confession no matter where he may be. To preside at matrimony ceremonies, Latin Church priests and deacons must have appropriate jurisdiction or delegation from a competent authority. In the Latin branch of the Catholic Church, the teaching is that it is the couple themselves who administer the graces of the sacrament; thus, although it is normally an ordained person who officiates at a marriage ceremony, a bishop may delegate a lay person to be present for the exchange of vows; this would be done only in extreme cases such as in mission territories. In the Eastern tradition, the clergy not only witness the exchange of vows but must impart a blessing for a valid marriage to have taken place. Unless a particular bishop has forbidden it, any bishop may preach throughout the Catholic Church and any priest or deacon may also preach anywhere (presuming the permission of local pastor) unless his faculty to preach has been restricted or removed. The cathedral of a diocese contains a special chair, called a cathedra, sometimes referred to as a throne, set aside in the sanctuary for the exclusive use of its Ordinary; it symbolizes his spiritual and ecclesiastical authority. Additional titles, status and roles Bishops may fill additional roles in the Catholic Church, including the following: Bishop-elect A bishop who has been appointed, but has not yet been ordained a bishop. (Episcopal ordination is the ceremony formally elevating the bishop-elect to his new rank.) Titular bishop A titular bishop (or titular archbishop) is a bishop who is not bishop of a diocese; unless (since 1970) he is coadjutor or emeritus, he is assigned to a titular see, which is usually the name of a city or area that used to be the seat of a diocese, but whose episcopal see (diocese) is no longer functioning as