Tyr, or Týr, is the god of war, single combat, victory and heroic glory in Norse mythology, portrayed as a one-handed man. He lost his right hand when Fenrir bit it off, but it was because of this deed he is regarded as brave. While he is a war god, he is also a god of law and justice.
In the late Icelandic Eddas, Tyr is portrayed, alternately, as the son of Odin (Prose Edda) or of Hymir (Poetic Edda), while the origins of his name and his possible relationship to Tuisto he was once considered the father of the gods and head of the pantheon, since his name is ultimately cognate to that of Dyaus, the reconstructed chief deity in Indo-European religion. It is assumed that Tyr was overtaken in popularity and in authority by both Odin and Thor at some point during the Migration Age.
Tyr was equated with Mars in the Interpretatio romana. The day Tuesday comes from his name.
"A war god known for his courage in Norse mythology. He lost his right hand when Fenrir bit it off, but it was because of this heroic deed he is regarded as brave. While he is a war god, he is also a god of law and justice. Equated with the Roman god Mars, the day Tuesday comes from his name."