A Storm of Swords
Lord Tywin Lannister tasks Tobho Mott with creating two new blades from the late Lord Eddard Stark's greatsword, Ice, with one for Tywin's grandson, King Joffrey I Baratheon, and one (Oathkeeper) for Tywin's son, Ser Jaime Lannister.
Tywin gives one of the swords to Joffrey before his wedding, replacing Hearteater. Accepting the name Widow's Wail when it is shouted by a guest, Joffrey uses the blade to destroy Lives of Four Kings, a gift from Tyrion Lannister.
Most Valyrian steel was a grey so dark it looked almost black, as was true here as well. But blended into the folds was a red so deep as the grey. The two colors lapped over one another without ever touching, each ripple distinct, like waves of night and blood upon some steely shore.—Tyrion Lannister's thoughts
—Joffrey I Baratheon to his guests