In 804 AD (the twentieth year of Zhenyuan in Tang Dezong), Zuyi went to the Congress Temple in Tiantai Mountain, Zhejiang Province to study Buddhism. When he returned to China the following year, he brought some tea seeds to Jinjiang (Shiga County) for trial planting. According to legend, the tea garden by the pond was planted by the Taishi. In 806, Japan's Konghai (a Buddhist master) came to China to study Buddhism, and also brought back many tea seeds, which were planted everywhere, but they were all planted on a trial basis, mainly for medicinal purposes. In the sixth year of Hong Ren (AD 8 15), he cruised to the Brahma Monastery in Shiga, and the monk Nancha drank it. The emperor was overjoyed and was given a royal crown. At that time, the emperor ordered the planting of tea as a tribute in Jinjiang, Danbo and Bomo. Since then, folk tea drinking has generally risen.
In the Southern Song Dynasty, Master Rong Xi visited China twice and visited Tiantai, Siming and Tiantong in Zhejiang. He has a deep understanding of Buddhism and was awarded the title of "Master Qian Guang" by Song Xiaozong. He brought tea seeds back to Japan, planted them in Feiqianling Zhenshan (southwest of Fukuoka), and wrote two volumes of "Eating Tea for Health", which strongly advocated the way of eating tea for health, and the Japanese culture of eating tea gradually flourished. Eating tea for health is regarded as the first tea book in Japan by Japan, and Rongxi is honored as the "Japanese tea ancestor". (Source: Selected Papers on Tea Studies in Zhuang Wan Fang)