曹洞宗
The key figure in the Caodong school was founder Dongshan Liangjie (807-869, Jpn. Tozan Ryokai). Some attribute the name "Cáodòng" as a union of "Dongshan" and "Caoshan", the latter from one of Dongshan's Dharma-heirs, Caoshan Benji; (840-901, Ts'ao-shan Pen-chi, Jpn. Sōzan Honjaku). However, the "Cao" much more likely came from "Cáoxī" (曹溪), the "mountain-name" of Huineng, the Sixth Ancestor of Chan, as Caoshan was of little importance unlike his contemporary and fellow Dharma-heir, Yunju Daoying. The school emphasised sitting meditation, and later "silent illumination" techniques.