||The title of this article is conjecture based on information revealed in the A Song of Ice and Fire novels and may be subject to change.
Lion's Tooth is a sword owned by Prince Joffrey Baratheon. Its name is a reference to the sigil of House Lannister, a lion, the house of Joffrey's mother, Queen Cersei Lannister.
It is thrown into the waters of the Trident by Arya Stark after the Prince attacks her and her friend Mycah with it and he is disabled by Nymeria. The sword is never recovered.
On the eve of the Battle of the Blackwater, Joffrey has it replaced with a new sword, Hearteater.