Artifacts from the 2nd century northwest India to Java and the Philippines have been found at Beikthano. Likewise, Pyu artefacts have been found along the coasts of Arakan, Lower Burma, and as far east as Óc Eo (in present-day southern Vietnam). The Pyu also conducted trade and diplomatic relations with China. In 800 and 801–802, Sri Ksetra sent a formal embassy, along with 35 musicians to the Tang court. According to the Chinese, the Pyu used gold and silver coinage. But only silver coins have survived. A notable feature of the Pyu states is the minting and use of silver coinage. Originated in the Pegu area, these coins date from the 5th century and were the model for most first millennium coinage in mainland Southeast Asia. The earliest type of these coins is not inscribed and depicts a conch on one side and a Srivatsa on the other. Many of the coins had a small hole along the perimeter, and may have also been used as amulets. Remarkably, after the use of coins ceased at the end of Pyu period in the late 9th century, coins did not reappear in the Burmese kingdoms until the 19th century. The culture of Pyu city states was heavily influenced by India. Indian culture was most visible in the southern Pyu realm through which most trade with India was conducted by sea. The names of southernmost cities were in Pali or Sanskrit derived like Sri Ksetra (Thaye Khittaya) and Vishnu (Beikthano). The kings at Sri Ksetra titled themselves as Varmans and Varma. It was not just a southern phenomenon. To varying degrees, northern Pyu cities and towns also became under the sway of Indian culture. The Burmese chronicles claim that the founding kings of Tagaung were descended from no less than the Sakya clan of the Buddha himself. By the 4th century, most of the Pyu had become predominantly Buddhist, though archaeological finds prove that their pre-Buddhist practices remained firmly entrenched in the following centuries. According to the excavated texts, as well as the Chinese records, the predominant religion of the Pyu was Theravada Buddhism. The Theravada school prevalent in the Pyu realm was probably derived from the Andhra region in southeast India, associated with the famous Theravada Buddhist scholar, Buddhagosa. It was the predominant Theravada school in Burma until the late 12th century when Shin Uttarajiva led the realignment with Ceylon's Mahavihara school.