Kingdom and Grand Duchy

As with the Piasts, the Jagiellonian dynasty became extinct through lack of a male heir (1572). In 1569 King Sigismundus Augustus effected the statutory union of Poland and Lithuania, up till then joined by a personal union. Henceforth the Kingdom of Poland and Grand Duchy of Lithuania would be an elective monarchy, with the entire noble (equestrian) estate enjoying the right to elect their king.

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