Zhào Xīhú 趙希鵠 (fl. c. 1180–1240). A Sòng imperial clansman, listed in the Sòng shǐ shìxì biǎo as a descendant of Tàizǔ via the Yānwáng Dézhāo 燕王德昭 branch. Domiciled at Yuánzhōu 袁州 (Yíchūn 宜春, Jiāngxī); internal reference in his book records his return from Lǐngyòu (Guǎngdōng) to Yíchūn in Jiāxī gēngzǐ (1240). His one surviving work, the Dòngtiān qīnglù 洞天清錄 (KR3j0167) in 1 juàn, is one of the foundational texts of Chinese antiquarian and connoisseurship literature, organized into eleven topical sections covering ancient qín, inkstones, bronzes, rare stones, water-droppers, brush-rests, calligraphy, stone-engravings, papers, and paintings. Beyond the date 1240 in the work itself, his career is undocumented. CBDB records no firm dates; Sìkù editors give fl. 1180–1240 as a conservative bracket.