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Gregory II began his pontificate; his conflict with Byzantine emperor Leo III eventually led to the establishment of the temporal power of the pope.
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Pope Gregory II
Head of the Catholic Church from 715 to 731
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Pope
Head of the Catholic Church
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Leo III the Isaurian
Byzantine emperor from 717 to 741
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Temporal power of the Holy See
Political and secular governmental activity of the popes of the Roman Catholic Church
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