Northern-Sòng Yìxué scholar, zì Jìmíng 季明. A senior student of 張載 Zhāng Zài at the Héngqú 橫渠 academy and one of the principal early transmitters of Guānxué 關學 doctrine. With his brother 蘇昱 Sū Yùn and the 呂大臨 Lǚ Dàlín / 呂大防 Lǚ Dàfáng brothers, he formed the inner circle of Zhāng Zài’s school.