Bona Sforza
Bona Sforza was a member of the powerful House of Sforza, which ruled the Duchy of Milan since 1447. In 1518, she became the second wife of Sigismund160I the Old, the King of Poland and Grand Duke of Lithuania. Their marriage lastedyears until Sigismunds death in 1548. Ambitious and energetic, Bona became heavily involved in the political life of PolandLithuania. To increase state revenue, she implemented various economic and agricultural reforms, including the farreaching Wallach Reform in the Grand Duchy of Lithuania. Her reforms made her the richest landowner in the Grand Duchy. In foreign policy, she opposed the Habsburgs and sought to secure her eldest daughter Isabella Jagiellon in the Kingdom of Hungary.
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Source: Wikipedia