IOAN CAS REX, bust of King Right, T.L.B. below (initials of the moneyers) / Horseman (Vytis) armed with sword and shield jumping over royal emblem SOLI MAG DVC LIT 1666 ("Solidus of the Grand Duke of Lithuania, 1666"), bird flying left, carrying ring (or wreath) in beak, and the Vasa crest in the talons, below the horseman (mark of Vincentas Gonsievskis). 16mm, 1.46 grams. Mint of Vilna. KM #50.
John II Casimir (22 March 1609 16 December 1672) was King of Poland and Grand Duke of Lithuania during the era of the PolishLithuanian Commonwealth, Duke of Opole in Upper Silesia, and titular King of Sweden 16481660. In Poland, he is known and commonly referred as Jan Kazimierz. His parents were Sigismund III Vasa (15661632) and Constance of Austria (15881631). His older brother, and predecessor on the throne, was Władysław IV Vasa. Related to the Habsburg rulers of the Holy Roman Empire he was the third and last monarch on the Polish throne from the House of Vasa. He was the last ruler of PolishLithuanian Commonwealth bearing a blood connection to the Jagiellon dynasty, through the female line.