Xǔ Hún 許渾 (c. 791 – after 858, zì Yònghuì 用晦, also Zhònghuì 仲晦), descendant of the Wǔzétiān-period chief minister Xǔ Yǔshī 許圉師 (the Ānlù Xǔshì line). His ancestral seat was Ānlù, but his actual home was at Dānyáng 丹陽 (modern Jiāngsū Zhènjiāng) — confirmed by his own poem Sòng Wáng Zǒng guī Dānyáng. Jìnshì of Dàhé 6 (832); served as Dāngtú and Tàipíng sub-prefect; took sick-leave; resumed as Rùnzhōu sīmǎ; Dàzhōng 3 (849) Jiānchá yùshǐ; later Yúbù yuánwàiláng, Mùzhōu and Yǐngzhōu prefectships. The literary nickname Xǔ Dīngmǎo and the title of his collection are from Dīngmǎo qiáo 丁卯橋 in Rùnzhōu, where Xǔ had a country villa.
Xǔ’s verse is comparatively conservative within the WǎnTáng spectrum — focused on huáigǔ (historical reflection), landscape, and bureaucratic-life lyric — and has been historically valued for clean structure and balanced parallelism rather than the dense allusiveness of WēnLǐ. The Xiányáng chéng dōng lóu — with the canonical couplet xī fēng chuī zǐ ěr / shān yǔ yù lái fēng mǎn lóu — is his most-anthologized poem. Xǔ’s verse was sufficiently in demand in the Sòng to be misattributed into Dù Mù’s Fánchuān biéjí (= KR4c0072) — a major textual problem in Liú Kèzhuāng’s reading of Dù Mù.
Principal work in the corpus: Dīngmǎo shī jí KR4c0079 in 2 juǎn (+ xùjí 2 + xùbǔ 1 + jíwài yíshī 1 in fuller transmission). CBDB id 92743 gives 791– (no death year recorded); standard reference works place his death after 858.