Qingliang Chengguan

Qingliang Chengguan (Chinese: 澄觀; pinyin: Chéngguān; Korean: Jinggwan; Japanese: Chōgan, 738–839 or 737-838 CE), was an important scholar-monk and patriarch of the Huayan school of Chinese Buddhism also known as Huayan pusa (bodhisattva Avatamsaka) and Qingliang Guoshi (Imperial Preceptor "Clear and Cool", Clear and Cool is a name for Mount Wutai).

Chengguan is most widely known for his extensive commentaries and sub-commentaries to the Avataṃsaka Sūtra (Huayan jing), as well as for his translation of a new Gandhavyuha sutra version, together with the Indian monk Prajña. Chengguan's commentaries on the Avataṃsaka quickly became one of the authoritative sources for Huayan doctrine. Chengguan lived through the reigns of nine emperors and was an honored teacher to seven emperors starting with Xuanzong (玄宗) until Wenzong (文宗). Chengguan was also the teacher of the influential Huayan patriarch Zongmi.