Count Hoyer was a general of King Henry V, the Holy Roman Emperor. On the eve of a battle of February 11, 1115, he boasted that he could not be defeated any more than a rock could show the imprint of his head. Immediately the rock softened and took the mark of his head. They battle was lost and Count Hoyer was killed. The rock can be found near Welsholz, Saxony, Germany.
- Leach, Maria, ed. (1984). Funk & Wagnalls Standard Dictionary of Folklore, Mythology, and Legend. New York: HarperCollins.