Xīfāngzǐ 西方子 (“Master from the West”), pseudonymous compiler of the Míngtáng jiǔ jīng 明堂灸經 (KR3e0018) — the eight-juan Sòng-or-Yuán moxibustion treatise printed at Píngyángfǔ 平陽府 in Shǎnxī. The pen-name suggests either a Western Regions origin or a Daoist self-styling; the SKQS editors note that they cannot identify Xīfāngzǐ historically. The book is dated by its Píngyángfǔ printing context to the late Northern Sòng or Jīn-Yuán period (the prefectural printing industry in Píngyáng was active from the late 11th into the 14th c.). The work is exclusively on moxibustion — no acupuncture content — and includes side-and-supine human-figure illustrations that are more detailed than those of the Tóngrén tradition. Xīfāngzǐ has no transmitted biographical record beyond this work.