Cathay "Pratica della mercatura", a guide about trade in China, a country he called "Cathay", noting the size of Khanbaliq (modern Beijing) and how merchants could exchange silver for Chinese paper money that could be used to buy luxury items such as silk. Words related to Khitay are still used in many Turkic and Slavic languages to refer to China. However, its use by Turkic speakers within China, such as the Uyghurs, is considered pejorative by the Chinese authority who had tried to ban it. As European and Arab travelers started reaching the Mongol Empire, they described the Mongol-controlled Northern China
Đại Cathay fled to Đà Lạt to hide until the end of 1966, when Đại Cathay was arrested by police and sent to Phú Quốc island, in which only then did Anh dare to return to Saigon. Duyên Anh's novel “Điệu ru nước mắt" (Tale of One Teardrop) was based off the life of Đại Cathay, and the novel was later adapted into a film by the same name directed by Lê Hoàng Hoa and was acted by two famous Vietnamese actors at the time Trần Quang and Thanh Nga. Đại Cathay Đại Cathay, whose real name was Lê Văn Đại was