Papacy

What is the origin of the statement "Rome has spoken, the matter is finished"?

The Bible says that Peter wasn't in Rome. So how could he be its first bishop?

I heard there was a pope in the thirteenth century who resigned. Is this true?

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How can the popes be infallible if they can contradict each other?

How do we know that the pope can make an infallible statement concerning doctrine? Has this ever been infallibly defined?

What if one pope contradicts another?

Why hasn't the pope consecrated Russia to the Immaculate Heart?

Is the pope similar to the high priest in the Old Testament?

Does papal infallibility mean the pope is perfect or inerrant?

How can you compare the Church of St. Pius X with that of John Paul II?