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.