From A Wiki of Ice and Fire
Hearteater is a sword owned by Joffrey Baratheon after he loses Lion's Tooth.
The pommel of Hearteaster is a ruby cut in the shape of a heart between a lion's jaws. Three fullers are incised deeply in the blade.
A Clash of Kings
King Joffrey I Baratheon has Sansa Stark kiss Hearteater before the Battle of the Blackwater.
A Storm of Swords
Joffrey receives Widow's Wail, a Valyrian steel sword, from his grandfather, Lord Tywin Lannister, before his marriage to Margaery Tyrell.
I'll deal with your brother after I'm done with my traitor uncle. I'll gut him with Hearteater, you'll see.
- ↑ 1.0 1.1 1.2 A Clash of Kings, Chapter 57, Sansa V.
- ↑ A Storm of Swords, Chapter 59, Sansa IV.