A bishop deputed to a diocesan who, capable of governing and
administering his diocese, is unable to perform the pontifical
functions; or whose diocese is so extensive that it requires the
labors of more than one; or whose episcopal see has attached to
it a royal or imperial office requiring protracted presence at
court. According to the present ecclesiastical discipline no
bishop can be consecrated without title to a certain and
distinct diocese which he governs either actually or
potentially. Actual government requires residence, potential
does not. Hence, there are two principal classes of bishops, the
residential, or diocesan or, local, or ordinary; and the non-
residential, or titular. Diocesan bishops have and exercise (de
jure) full power of order and jurisdiction, in and over the
diocese committed to their exclusive care by the pope. Titulars,
as such, have not, and do not exercise, power of order and
jurisdiction, in and over their titular sees. All actual
jurisdiction in titular sees the pope reserve