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Amadeus VIII

count (1391-1416) and duke (1416-40) of Savoy, first member of the house of Savoy to assume the title of duke. His 42-year reign saw the extension of his authority from Lake Neuchatel on the north to the Ligurian coast, and under the title of Felix V he was an antipope for 10 years (1439-49).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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