Next Stop: Ragnarok.
Tyr (or Tiw, Ziw) is the ancient god of War and the
Lawgiver of the gods. He sacrifices his hand so
that the evil Fenris wolf may be bound. At one
time he was the leader of the Norse Pantheon,
but was supplanted by Odin much later. There is
nothing to indicate how this occurred; one
assumes that he simply "stepped back"
and let Odin assume the position of leadership.
Tyr is excellent in all manners of Justice,
fair play, and Right Action.
What Norse God Are You?
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On a related note, here's a fairly interesting (if often drenched in Educationese) long essay about the popularity of Marvel Comics' Thor character.