Ice
From Asoiaf
Ice is the greatsword of House Stark. Forged of Valyrian steel it is dark as smoke.
The sword was made four hundred years ago. The name is a legacy from the Kings in the North.
Gared, a deserter from the Night's Watch, was captured outside a small holdfast near Winterfell. Eddard Stark, Lord of Winterfell rode out with Robb Stark, Brandon Stark, Jon Snow, Theon Greyjoy, Jory Cassel, Hullen and Harwin and 12 others to see justice done. Eddard condemned Gared to death and beheaded him with Ice. Returning home Eddard went to the godswood to cleanse himself and his sword.