Uncharted 2: Among Thieves is the sequel to the hit ps3 title Uncharted:Drake's Fourtune. Among Thieves revolves around the doomed voyage home of Marco Polo from China in 1292. After spending almost 20 years in the court of the Mongol Emperor Kublai Khan, Marco Polo departed with fourteen ships and over six hundred passengers – but when he arrived at Persia a year and a half later, only one ship and eighteen passengers remained. Polo never revealed what had happened to the lost ships. It turns out Marco Polo had discovered a massive saphire called the "Chintamani Stone".