Just some GOT trivia:
Swords made of Valyrian steel are lighter, sharper, and harder than ordinary castle forged swords. Only master craftsmen from Valyria knew how to work the material and it is said that they used magic to do so. But Valyria is long gone, swallowed-up by the earth in a cataclysm known as The Doom more than 300 years ago. As such, Valyrian swords are now ultra rare, highly coveted, and considered ancestral heirlooms in Westeros.
The Starks had their long sword Ice. Jeor Mormont of Bear Island gave his to Jon Snow, which Jon renamed Longclaw. Randyll Tarley (Sam's dad) has Heartsbane. The Lannisters had Brightroar but lost it long ago somewhere in Essos. There are a few more including the dagger Joffrey gave to the catspaw to kill Bran.