Tyrfing

Tyrfing, Tirfing or Tyrving (The name is of uncertain origin, possibly connected to the Terwingi) was a magic sword in Norse mythology, which figures in the Tyrfing Cycle, which includes a poem from the Poetic Edda called Hervararkviða, and the Hervarar saga. The name is also used in the saga to denote the Goths. The form Tervingi was actually recorded by Roman sources in the 4th century.