Léi Xiào 雷斆 (also written 雷敩, fl. 5th c., 南朝·宋), conventionally identified with the legendary “Lord Léi” 雷公 of the Yellow-Emperor pharmacological tradition (though that identification is a later medieval projection — the actual historical Léi Xiào is the late-Liú-Sòng-period author of the Léi gōng pào zhì lùn 雷公炮炙論 KR3ec086). His dates and biographical details are not securely known; the Sòng shǐ Yìwénzhì records the work as being in 3 juǎn and attributes it to 雷敩. The Léi gōng pào zhì lùn is the earliest systematic Chinese treatise on drug processing (pào zhì 炮炙 — the techniques of heating, cleaning, soaking, fermenting, slicing, calcining, and otherwise modifying raw drug substances before clinical use). Approximately 300 substances are covered. The work is the founding text of the Chinese pào zhì tradition that continues through to the modern PRC standardisation of Chinese-medicine drug processing. Not in CBDB.