(7th or 8th c.).
A Chinese Ch'an recluse and mountain ascetic famous for a collection of poems that were found written on trees and walls scattered around the T'ien-t'ai mountain in south-east China where he lived. Very little is known about him, but stories abound of his relationship with Shih-te, a kitchen monk at a nearby temple where Han-shan sometimes came for food. The two of them engaged in extremely eccentric conversation and behaviour, much of which has survived in the memory of the ‘wild Ch'an’ tradition. Over 300 poems attributed to him are gathered in the collection.