"Guglielmo Gonzaga (24 April 1538 – 14 August 1587) was Duke of Mantua from 1550 to 1587, and of Montferrat from 1574 to 1587. He was ...
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the second son of Federico II Gonzaga, Duke of Mantua and Margaret Palaeologina of Montferrat. In 1574, Montferrat was elevated to a Duchy and Guglielmo became its first duke. He was succeeded as Duke of both duchies by his son Vincenzo." - (en.wikipedia.org 28.01.2022)
