Guglielmo Gonzaga, Duke of Mantua
Guglielmo Gonzaga was Duke of Mantua and Montferrat from 1550 to 1587. He was the second son of Federico II Gonzaga, Duke of Mantua and Margaret Palaeologina of Montferrat. In 1574, Montferrat was elevated to a Duchy and he became its first duke. He was succeeded by his son Vincenzo.
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Source: Wikipedia