Diana di Cordona
Encyclopedia
Diana di Cordona was an Italian noblewoman, who was mistress
Mistress (lover)
A mistress is a long-term female lover and companion who is not married to her partner; the term is used especially when her partner is married. The relationship generally is stable and at least semi-permanent; however, the couple does not live together openly. Also the relationship is usually,...

 of Sigismund II Augustus
Sigismund II Augustus
Sigismund II Augustus I was King of Poland and Grand Duke of Lithuania, the only son of Sigismund I the Old, whom Sigismund II succeeded in 1548...

 and Cesare I Gonzaga
Cesare I Gonzaga
Cesare I Gonzaga was count of Guastalla from 1557 until his death. He was a member of the House of Gonzaga, the first-born son of the imperial condottiero Ferrante Gonzaga and Isabella di Capua. From the latter he inherited also the title of Count of Amalfi. He was also Duke of Ariano and Prince...

.Who later in life went missing and was presumed to be dead in 1550.
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