With a few words in Latin, Pope Benedict XVI did what no pope has done in more than half a millennium, stunning the world by announcing his resignation Monday and leaving the already troubled Catholic Church to replace the leader of its 1 billion followers by Easter.

Not even his closest associates had advance word of the news, a bombshell that he dropped during a routine meeting of Vatican cardinals. And with no clear favorites to succeed him, another surprise likely awaits when the cardinals elect Benedict's successor next month.

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