Siegfried, a hero of various Scandinavian and Teutonic legends, and especially of the “Nibelungen Lied” (q.v.), was rendered invulnerable by bathing in the blood of a dragon which he had slain, except at a spot on his body which had been covered by a falling leaf; he wore a cloak which rendered him invisible, and wielded a miraculous sword named Balmung (q.v.).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Siebengebirge * Siemens, Werner von