----- 教皇博尼法斯八世及其时代的历史
To write a complete history of the human family, it will suffice then to discern these generating facts; because from a study of them every other fact will be revealed, being made clear by the light from the generating fact. Hence, turning our attention to events which form the history of society from the fall of the Latin Empire to our own times, we find three events which merit the name of revolutions; namely, the terrible invasion of the Barbarians into Europe; the quarrel of Philip the Fair with the Holy See; and the revolution at the end of the eighteenth century, commonly called the French Revolution.
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