Slovakia #20c 20 Korun (2004) - $3.20

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Pribina, also called Priwina or Privina by Frankish chronicles, was the ruler and Prince of the Principality of Nitra before 833, and established and ruled the Balaton Principality from 839/840 to 861. Wikipedia
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Nitra Castle built in 11th century, located in the Old Town of Nitra, Slovakia. It is a dominant of the city and a national cultural monument. It is the seat of the Diocese of Nitra. Wikipedia