Féng Zhì 馮贄 (fl. 904, traditional attribution). The only source for his existence is the self-preface to KR3l0016 Yúnxiān záilù 雲仙雜記, dated Tiānyòu 1 (904) — the last reign-year of the Táng — in which he claims a family library of more than 200,000 juàn “across nine generations.” No external biographical evidence corroborates this person; CBDB id 92434 records the name without lifedates or career data. From the late Sòng (Chén Zhènsūn, Hú Yìnglín) to modern times (Yú Jiāxī 余嘉錫), the Yúnxiān záilù and its supposed author have been suspected as a literary fiction — that is, the self-preface and the hào “Féng Zhì” may themselves be part of the work’s elaborate apparatus of invented sources. The lifedates 904 and the late-Táng attribution should accordingly be treated with caution. No other surviving work is attributed to him.