Nemean Lion's Pelt

The Nemean lion's pelt is a magical spoil of war formerly owned by Percy Jackson. Although in ancient times it remained a lion's pelt, in modern times it becomes a bulletproof and generally weapon-proof leather jacket. It was obtained when Percy killed the Nemean lion in The Titan's Curse on the quest after the monster Artemis is chasing.

Hercules
The Nemean lion's pelt was once worn by a son of Zeus, Hercules, in ancient times. Little is revealed about what he did with it in the book, but in Greek Mythology he wore it as a cape of sorts. The pelt later returned magically to the Nemean lion once the monster was reborn in the Underworld.

Percy Jackson
Percy Jackson later won the pelt after defeating the lion in the National Air and Space Museum in Washington, D.C.; it proved useful to him several times in battle with the skeletons that the Titan General sent after him and Thalia, and it was also quite fashionable, according to Thalia.

Gods
Percy later tossed the pelt into the sea as a sacrifice to Poseidon when Grover says that he can take the monster that they were chasing back to Long Island and Olympus itself. It is unknown whether the god received it or it returned to the lion itself.