<P> 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 . </P> <P> 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 . </P> <P> 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 . </P> <P> Bishops may fill additional roles in the Catholic Church, including the following: </P>

Total number of bishops in the catholic church