His parents had been Vincenzo Gonzaga and Maria Vittoria Gonzaga.
Giuseppe Gonzaga - Source picture: Wikipedia
Giuseppe was mentally handicapped and wouldn't probably never have
married but in 1731 there was an arragement with the 16th. year old
Eleonore of Holstein (daughter of Leopold of Schleswig-Holstein).
The marriage remained childless.
Between 1734 and 1738 the Duchy was occupied by the French Troops.
On August 16th. 1746 Giuseppe died. Later the Duchy was
annexed with Austria.
Guastalla is a town in Emilia-Romagna. This is located on the right banks
of the Po River in Italy.