Yunyan Tansheng dating history

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Yunyan Tansheng (Chinese: 雲巖曇晟; pinyin: Yúnyán Tánshèng; Wade–Giles: Yün-yen T'an-shêng; Japanese: Ungan Donjō; Korean: Unam Tamsŭng; Vietnamese: Vân Nham Đàm Thạnh) was a Chan Buddhist monk during the Tang dynasty. Ancient biographies record that he was from Jianchang. He is said to have become a monk when he was sixteen at Shimen Temple with Baizhang Huaihai as his teacher. After twenty years with him, Baizhang died and Yuyan had still had not attained enlightenment. He visited many teachers before settling on Yaoshan Weiyan as his new master. The first part of his name comes from Yunyan Mountain, which is outside of modern Changsha, where he taught after studying with Yaoshan. Recorded dialogues involving Yunyan often include him and his fellow student, Daowu Yuanzhi. He supposedly died from illness, the day before which he ordered his students to prepare for a banquet because a monk was preparing to depart the monastery.