Slovakia | 20 Korúna, 2006 | Obverse: Prince Pribina, the first known Slovak ruler whose seat was in Nitra until 833 AD | Reverse: Nitra Castle, The main design is overprinted by part of a coral necklace dating from the 9th century with a crescent-shaped bronze locket, which was found by archaelogists at Nitra-Lupky | Watermark: Profile portrait of Prince Pribina