The Prague Castle skeleton (given the identification number IIIN199) is a human skeleton that was discovered in 1928 at Prague Castle in Czechoslovakia, now part of the Czech Republic. The burial was excavated by archaeologist Ivan Borkovský as part of a Czech National Museum project. The skeleton was dated to the 9th or 10th century AD and was associated with high-value burial goods. Ethnic identification of the deceased became controversial.
During the German occupation of Czechoslovakia during the Second World War, Borkovský was forced to withdraw a book he had published identifying early Slavic influence in the region. He was also forced to publish a journal article identifying the burial as Germanic or Nordic, to support a Nazi claim of early German involvement in the region. After the end of the war and with Prague under Soviet occupation Borkovský published a paper retracting this earlier work and identifying IIIN199 as a nobleman of the Přemyslid dynasty. The skeleton was kept in storage until 2004 and, though it has been tested extensively since then, a definitive identification has not been possible.