The Rider that used to wield it is Brom, father of Eragon and Rider of a different dragon named Saphira (the original).
Brom is the founder of the Varden.
It is unknown what jewel was in its pommel, although it is presumably an aquamarine.
It means "Woundbiter" in the ancient language. The sword is currently lost. It might still be in Galbatorix' collection though.