 According to Mindy MacLeod and Bernard Mees, the amulets appear in Viking Age graves, and were presumably placed there because "they were thought to have protective powers".The Tjängvide image stone from the Baltic island of Gotland, Sweden features a rider on an eight-legged horse, which may be Odin's eight-legged horse Sleipnir, being greeted by a female, which may be a valkyrie at Valhalla.The 11th century runestone U 1163 features a carving of a female bearing a horn that has been interpreted as the valkyrie Sigrdrífa handing the hero Sigurd (also depicted on the stone) a drinking horn.