This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
The Five Ranks are Dongshan Liangjie's best remembered teaching, but they were not a solitary production. Together with his own disciple, Caoshan Benji, Dongshan is credited as co-founder of the Caodong school of Chan, a name that combines a syllable from each of their associated mountains rather than naming either teacher alone, a detail article one's account of the Five Ranks themselves does not mention.
Dongshan was born in 807 in the Kuaiji region of what is now Zhejiang province, and died in 869. The school he and Caoshan built together outlived both of them by many centuries: transmitted to Japan, Caodong became the Soto school of Zen, which stands today as one of the two largest Zen lineages there alongside Rinzai, the school descended from Linji Yixuan.
A teacher and his own student sharing founder's credit, rather than a single named originator, is unusual among the Five Houses of Chan, most of which trace to one figure. That the Five Ranks became Caodong's philosophical signature rather than remaining one teacher's private formulation owes something to this shared founding itself: a system worked out and carried forward by two linked teachers, memorialized in a school name built from both of them, was better positioned to outlast either master than a teaching credited to one name alone.