Since the position of
Pope is required to be "usque ad mortem" (until death), when the
Pope of
Rome resigns, quits, or is removed from his Pontificate before his natural death, such leaving of office is known as Pontificatus Interruptus.
Due to his resignation from office, Pope Benedict XVI, whose previous
name was title and
name was Cardinal Ratzinger, will
forever be known as Pontificatus Interruptus.