Féng Yǐ 馮椅 (lifedates not securely recorded; floruit 1217 per the Hòuzhāi Yì xué auto-preface), zì Yízhī 儀之 (or Qízhī 奇之), hào Hòuzhāi 厚齋, of Nánkāng Dūchāng 南康都昌 (modern Dūchāng county, north of Póyáng Lake, Jiāngxī).
A Southern-Sòng jiā jū shòu tú 家居授徒 (“home-residing, teaching disciples”) scholar of the ZhūXī mainline who never held substantial office. The principal biographical record is in the Sòngshǐ biography of his son, Féng Qùfēi 馮去非 (juan 425), which summarily registers the father’s lifework: “The books he authored — Yì, Shū, Shī, YǔMèng jíshuō — totaled over two hundred juan; today most are not transmitted; only his collated Yì-discussions still scatter in the Yǒnglè dàdiǎn.” His learning in the Yì derived from his uncle (bózǔfù 伯祖父) Féng Fú 馮黼, who “was famous in the three-academies for this canonical text” (auto-preface).
CBDB id 48317; lifedates not recorded.
Within the Kanripo corpus he is the author of KR1a0046 Hòuzhāi Yì xué 厚齋易學 — a 50-juan tripartite work (Yì jízhù 易輯注 in 4 juan, Yì jízhuàn 易輯傳 in 28 juan, Yì wàizhuàn 易外傳 in 18 juan), originally circulated as three separate books and merged into one work only in the Yǒnglè dàdiǎn compilation, then reorganized to its original tripartite structure by the Sìkù editors.
He is also the principal documentary preservation source for ten or more Northern-and-Southern Sòng Yì-commentators — Wáng Ānshí 王安石, Zhāng Bì 張弼, Zhāng Rǔmíng 張汝明, Lǐ Chūnnián 李椿年, Lǐ Yuánliàng 李元量, Lǐ Shùnchén 李舜臣, Lǘqiū Xīn 閭丘昕, Máo Pǔ 毛樸, Féng Shíxíng 馮時行, Lán Tíngruì 蘭廷瑞, et al. — whose complete works are now lost.