Wikipedia
Murgleys
Murgleys, or Murgleis (possibly "Death brand") is the sword of Ganelon, a traitorous French (Frankish) count and nemesis to the titular hero of the epic La chanson de Roland ( The Song of Roland).
According to the French version, its "gold pommel" held some kind of a "holy relic". In the Middle High German adaptation ( Konrad der Pfaffe's Rolandslied) the sword is called Mulagir, touted to be the "best seax (type of sword) in all of France", described as having a carbuncle shining on its pommel, and forged by a smith named Madelger in Regensburg.