程子 Chéngzǐ

Chéngzǐ 程子, collective honorific of the Northern-Sòng Neo-Confucian brothers 程顥 Chéng Hào (1032–1085) and 程頤 Chéng Yí (1033–1107) of Luòyáng; founders of the Luò-school of Neo-Confucianism. Cited in 楊繼洲 Yáng Jìzhōu’s Zhēndào yuánliú 針道源流 essay (preface to the Zhēnjiǔ dàchéng KR3ee027) on the dating of the Sùwèn to the end of the Warring States.