Tyr was the god of war.  His father was Odin. His day of the week is Tuesday - his Saxon name was Tiu.
     Here is a popular myth on Tyr.
     The wolf Fenrir was one of the many children of Loki.  Fenrir lived in Asgard, the home of the gods. Fenrir grew so big and mean that everyone but Tyr was afraid to feed him.
     The gods  decided to chain Fenrir.  The  dwarves  made a chain that was unbreakable.  Fenrir got suspicious and refused to let anyone come near him unless Tyr stuck his hand in Fenrir's mouth. When the gods tied Fenrir up he became angry and Tyr lost his hand.