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.