Caodong school
The Caodong school was founded by Dongshan Liangjie and his Dharma-heirs in the 9th century. Some attribute the name "Cáodòng" as a union of "Dongshan" and "Caoshan" from one of his Dharma-heirs, Caoshan Benji; however, the "Cao" could also have come from "Cáoxī" (曹溪), the "mountain-name" of Huineng, the Sixth Ancestor of Chan. The sect emphasized sitting meditation, and later "silent illumination" techniques.