Xú Lùqīng 徐鹿卿 (zì Défū 德夫, hào Quángǔ 泉谷, posthumous name Qīngzhèng 清正) was a native of Fēngchéng 豐城 (modern Jiāngxī). He took his jìnshì in Jiādìng 嘉定 16 (1223) and rose through a series of posts — Erudite of the Directorate of Education (國子監主簿), Vice-Minister of the Court of the Imperial Treasury (太府少卿), Vice-Minister of Rites (禮部侍郎) — retiring as Auxiliary Academician of the Huáwén Hall (華文閣待制). His biography is in Sòngshǐ. He was a close associate of Zhēn Déxiù 真德秀 (Xīshān 西山), who had recommended him as a man of “deep learning and upright character”; Liú Kèzhuāng 劉克莊 praised him as combining “the purity of [Dǒng] Zhòngshū with the practicality of Jiǎ Yì” (董子之醇,賈生之通). He is principally remembered for his outspoken memorials denouncing factional politics, imperial favourites, the deteriorating paper currency (chǔ 楮), and the empire’s military weakness — themes developed across his memorials on the capital fire of 1232 and the 1240s frontier crisis. His original Quángǔ wénjí and several specialized policy compilations were lost; the surviving Qīngzhèng cúngǎo KR4d0335 is a Wànlì-era reconstitution by his twelfth-generation descendant Xú Jiàn 徐鑒.