Without a Western Emperor, Leo hoped to use Ricimer as his effective vicegerent in the West.
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His role was more that of an ambassador and vicegerent of Venice than a vassal to the empire.
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The Shia believe that these Quranic verses make it clear that only God chooses a vicegerent on Earth, therefore no one else has a choice in the matter.
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He was resolved to gather the Christian world under his banner and to exercise his power through his vicegerent, the proud pontiff who claimed to be the representative of Christ.
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Someone appointed by a ruler as an administrative deputy
Vicegerent is the official administrative deputy of a ruler or head of state: vice (in place of) + gerere (to carry on, conduct).
Something that takes the place of another. In the 17th century often applied to rulers as representatives of God.