(en) The Duchy of Prussia is a hereditary territorial principality vassal of the King of Poland, founded in 1525 during the secularization of the Teutonic State by its Grand Master Albert of Brandenburg-Ansbach. In 1618, the duchy fell to the elector of Brandenburg John III Sigismund, of the house of Hohenzollern. Thus is achieved a personal union of the two territories (State of Brandenburg-Prussia), which is the foundation of the Kingdom of Prussia of the 18th century.
Wikidata: Q153091
Los revisores de Numista para las monedas de este emisor son Compendium y smy77.
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