Zhāng Sìgǔ 張嗣古, fl. early thirteenth century. Took up the worn woodblocks of the Dà Yì cuì yán 大易粹言 (KR1a0041) at the Shūzhōu prefectural school and in Jiādìng guǐyǒu (1213) prepared the supplement-cutting that became the textual base for the Sìkù recension. His colophon, originally placed at the end of the work, was moved to the head in the surviving Jiǎng-family copy and restored to its proper position by the Sìkù editors.