Guō Sānyì 郭三益 was a Northern-Sòng jìnshì 進士 (Jiāxīng 嘉興, also Chángzhōu 常州 jìnshì roll) of the Huīzōng era, working life dated by CBDB to 1088. He was the son or uncle of Guō Zhīxún 郭知訓 (CBDB 945), and (through his father Guō Zhuàn 郭瑑) is associated with both Jiāxīng and Chángzhōu (his father’s wife was a Chángzhōu Wújìn 武進 resident; CBDB attributes the family move to Chángzhōu to that connection). His attested writing in the Daozang corpus is the earlier preface (dated Xuānhé yuán nián shíyī yuè shàngsì 宣和元年十一月上巳, the shàngsì day of the eleventh month of Xuānhé 1, i.e. 1119) to a set of Jīndān tú 金丹圖 diagrams later transmitted in the Huò family lineage and printed as part of [[KR5a0291|Xiāntiān jīndān dàdào xuán’ào kǒujué 先天金丹大道玄奧口訣]] (DZ 279). The preface explains that Guō received the diagrams (which he attributed to Chén Tuán 陳摶 d. 989, on the authority of Lín Língsù 林靈素) and returned them to the Huò family, with which his family had close ties — establishing the genealogical thread that the 1249–1257 production of DZ 279 takes up.
Sources: Chéng Jū 程俱, Wén jí 文集 31.11a–13a; Zhèjiāng tōngzhì 浙江通志 124.8b; Jiāhé zhì 嘉禾志 15.2b; Pílíng zhì 毗陵志 11.12a; CBD 3, 2129.