Which country did the ancient Tiantuo come from?

[Edit this paragraph] Tianzhu is the collective name of ancient China and other East Asian countries for India and other Indian subcontinent countries today. There have been four empires in Tianzhu history: Peacock Empire, Gupta Empire, Sultanate of Delhi and Mughal Empire. The earliest record of India in China's history is Records of the Historian and Biography of Dawan, which was called Body Poison at that time (the Indus Sanskrit-Sindh antithesis), and The Classic of Mountains and Seas records "a country with body poison in the West". "Hanshu" records that "thousands of miles from the southeast, Shujia people's market." . "Biography of the Western Regions in the Later Han Dynasty" records that "Tianzhu was poisoned by one person". The early Tang Dynasty was collectively called Tianzhu. Later, Xuanzang learned from the Western Regions and changed his name to India by pronunciation. India is a famous ancient civilization and the birthplace of Buddhism. Indians created splendid ancient civilizations and many inventions, such as Arabic numerals, chess and sugar cane. Modern India fell into political turmoil, and gained independence in 1947, but split into two countries: India and Pakistan. Indian society once had a strict class system, namely "caste system", which was divided into four classes: Brahman, Khrushchev, Veda and sudra. In addition, there are Dalits who are lower in rank than sudra and do not belong to these four surname classes. At that time, intermarriage between castes was not allowed, and offenders hell to pay might even be put to death. Although the Indian Constitution now explicitly prohibits class discrimination and abolishes the caste system, because the "caste system" has been rooted in Hindu beliefs for thousands of years, unless the belief is abandoned, the lower caste will be bound by its teachings for life.