Not only stones testify of the existence of King Purnawarman and his Tarumanagara kingdom. There are also Chinese historical sources, since Tarumanagara maintained extended trade and diplomatic relations in the territory stretching between India and China. The Chinese Buddhist Monk Fa Xian reported in his book "Fo-kuo-chi" (414) that he stayed on the island of "Ye-po-ti" (Chinese spelling of Javadvipa), most probably the western part of Java island, for six months, from December 412 until May 413. He reported that the Law of Buddha was not much known, but that the Brahmans (Hinduism) flourished, and heretics (animists) too.