Guglielmo Gonzaga was Duke of Mantua from 1550 to 1587, and of Montferrat from 1574 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... Wikipedia
Born: April 24, 1538, Mantua, Italy
Died: August 14, 1587 (age 49 years), Goito, Italy
Great grandchildren: Maria Gonzaga, Duchess of Montferrat, Nicole, Duchess of Lorraine, Claude-Françoise of Lorraine, and more
Parents: Federico II Gonzaga, Duke of Mantua and Margaret Paleologa
Spouse: Archduchess Eleanor of Austria (m. 1561)