Liú Yù 劉郁 (fl. c. 1259–1263), zì Wénjì 文季, of Zhēndìng 真定 (modern Zhèngdìng 正定 in Héběi). His biography is largely lost; CBDB (id 28857) places his floruit before 1260, consistent with the dates of the events recorded in his sole surviving work, the Xīshǐ jì 西使記 (KR2g0057) of c. 1263. He served in some capacity at the early Yuán court, evidently with access to envoys returning from Hülegü’s western campaign of 1252–1260; he edited the report of Cháng Dé 常徳 — the Sìchuān-born observer dispatched to Hülegü’s army in Qiányuán 1 (1259) — into the present Xīshǐ jì, the principal surviving Chinese-language eyewitness source on the Mongol Yīlì hànguó (Ilkhanate) and on the Mongol sack of Baghdad (1258). Wáng Yún 王惲 (1227–1304) incorporated the same text into his Yùtáng zájì 玉堂雜記; the Xīshǐ jì is the separately-circulating recension. Note: CBDB lists multiple homonyms (ids 11526 — different person; 28857 — this Yuán figure; 110876–8 — undated). The Zhēndìng fl.-1260 figure (id 28857) is the present author.