The decentralized government and divisive alliances of the aristocrats destabilized Poland, creating a tumult in the Commonwealth. When the last king of the Jagiellonian dynasty died without an heir in the late sixteenth century, the magnates experimented with elections, creating a new system in which the nobility voted on the monarch. The Polish lords chose a French prince, Henri de Valois, to be king, but they required him and future monarchs to sign the “Henrician Articles.” These included a stipulation that the monarchy was not hereditary but elected, and that the king must call a session
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Poland was experimenting with a republican elected monarchy, albeit a caste based one, and liberal tenets like freedom of religion, in the 1500's

