Yüan-wu K'o-ch'in (1063-1135)

A Chinese Ch'an monk known mainly as the editor of the Blue Cliff Records (Chinese, Pi-yen lu; Jap., Hekigan-roku), a collection of kōans first compiled by Hsüeh-tou Ch'ung-hsien (980-1052). Hsüeh-tou had compiled the 100 cases comprising the work and added his own verse to them, while Yüan-wu added an introduction and commentaries to the case and Hsüeh-tou's verse to each case.

A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)