Tán Sìxiān 譚嗣先 (zì Dàolín 道林), late-Yuán / early-Míng Daoist of the Qīngyuánguàn 青元觀 in Jùróng 句容 (Dānyáng 丹陽). His clan is identified in Zhū Chuò’s preface as the 於溪 Tán of Dānyáng, “an old gentry family.” His teacher was Zhúyánwēng 竹巖翁, identified by Zhū as Gòng Wéilín 貢惟琳 of Liǔrú in Dānyáng, “a thoroughgoing Confucian who in old age took up the qín and revered the path of the Duke-Immortal.” Tán is the compiler of the Tàijí Gě xiāngōng zhuàn 太極葛仙公傳 (DZ 450, see KR5b0134), drawn up at Zhúyán’s instigation on the basis of an older Géfūshān recension of the Gě Xuán biography and presented to Zhū Chuò after Zhúyán’s death; Zhū revised the manuscript and prefaced it in 1377. Tán is otherwise unattested in the standard biographical sources, and CBDB has no record for him.