Sigurd (Old Norse: Sigurðr) is a strong hero in the "Nibelungenlied", a epic poem written about the year 1200. He killed the dragon Fafnir and took its treasure, the "Nibelungenschatz". After killing the dragon, he bathed in its blood and so changed his skin, so that he could not be wounded any more. The earliest extant representations for his legend come in pictorial form from seven runestones in Sweden and most notably the Ramsund carving (c. 1000) and the Gök Runestone (11th century).