Zǐyuán 紫源, Southern-Sòng court physician of Gāozōng’s Hànlín Medical Bureau, fl. mid-12th century. One of the four named editors of the Shàoxīng běncǎo 紹興本草 (KR3ec014) of 1159. The unusual single-character given name “Zǐyuán” suggests this may be a Daoist hào (religious sobriquet) rather than a personal name; if so, the underlying identity is not now recoverable. No independent biography; no CBDB record.