George, Duke of Saxony
In February 1530, ten-year-old Sigismund II Augustus was co-crowned "vivente rege" as King of Poland (his father was still alive and of strong health) to secure his inheritance in Poland. Envoys of George, Duke of Saxony, attended the coronation ceremony and negotiated the marriage between Elizabeth and Sigismund August on behalf of Ferdinand. Great Chancellor of the Crown Krzysztof Szydłowiecki supported the wedding and organized a preliminary marriage treaty, signed on 10–11 November 1530 in Poznań. According to the treaty, the marriage was to take place in 1533 when Elizabeth reached the age of 7. Her dowry was 100,000 ducats. In exchange, the Poles would grant her the cities of Nowy Sącz, Sanok, Przemyśl, Biecz.