Tyr is the original Germanic god of war and the patron god of justice, the precursor of Odin. At the time of the Vikings, Tyr had to make way for Odin, who became the god of war himself. Tyr was by then regarded as Odin's son (or possibly of the giant Hymir). He is the boldest of the gods, who inspires courage and heroism in battle. Tyr is represented as a man with one hand, because his right hand was bitten off by the gigantic wolf Fenrir (in old-Norse, the wrist was called 'wolf-joint'). His attribute is a spear; the symbol of justice, as well as a weapon.

At the day of Ragnarok, Tyr will kill the hound Garm, the guardian of the hell, but will die from the wounds inflicted by the animal. In later mythology, "Tyr" became to mean "god". He is also known as Tîwaz, Tiw and Ziu.

(Source www.pantheon.org)