Alexander Jagiellon
Casimir IV Jagiellon was both King of Poland and Grand Duke of Lithuania. In his last will Casimir stipulated that the two states would be ruled by separately two of his sons. Thus after his death in 1492, John I Albert was elected to the Polish throne, while the Lithuanian Council of Lords chose Alexander Jagiellon. Thus the personal union between Poland and Lithuania was broken. The union at that time could be described as a dynastic union.