Tyr is the ancient god of War and the Lawgiver of the gods. The bravest of the gods, it is Tyr who makes the binding of Fenrir (Myth 7) possible by sacrificing his right hand. At one time he was the leader of the Norse Pantheon, but was supplanted by Odin much later.
Tyr also seems to be a god of justice. His name is derived from Tiw or Tiwaz an Tacticus and other Roman writers have equated this character to Mars, the receiver of human sacrifice. His day is Tuesday.
Tyr was the son of Odin though in Myth 17 he is made out to be the son of the giant Hymir. Like Odin, he has many characteristics of the earlier Germanic gods of battle. Parallels in other mythologies along with archaeological discoveries relating to a one-handed god, suggest that this character is very old and was known in Northern Europe somewhere between one and two thousand years before Snorri Sturluson included it in his Prose Edda. Similarities can be found in the one-handed Naudu in Irish mythology and in Mitra, just god of the day, of Indian mythology.