Fenrir bites off Tyr’s hand. Illustration from a 17th century Icelandic manuscript.
Tyr is the god of war and justice in Norse mythology, and the etymology of his name suggests that he once was at the top of the Germanic pantheon, although he had been replaced by Odin/Wodan relatively early.
Fenrir is one of the children of Loki, bound to kill the All-father himself in the final battle, Ragnarök.
To prevent this from happening, the gods bound Fenrir, but the wolf demanded Tyr’s hand as a token.
When he realised, he couldn’t come free, he bit off his hand.