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 and swallow a live cockroach in front of his crew, which Cathay vomited in disgust. Despite that, he still would not incriminate his fellow brothers and sisters. In face of such stubbornness, the police sent Đại to the Thủ Đức Juvenile Reformatory. These reformatory facilities’ sole purpose however was to house kids until they became old enough to be conscripted into the military, earning them a reputation as a "birthplace of thugs". It was in these halls that Cathay later befriended some of his later comrades that would assist him during his reign of Saigon. After leaving the reformatory, Cathay