The founder of Hwaŏm (Chin., Hua-yen) Buddhism in Korea. Ŭisang travelled to China.settling in the capital of the T'ang dynasty, Ch'ang-an. There he studied with the second Hua-yen patriarch Chih-yen (600–68), and held seniority over the third patriarch Fa-tsang (643–712). After 20 years, he returned to Korea and founded Hwaŏm studies. The integrative vision of Hwaŏm, which stresses the mutual and unobstructed interpenetration of all phenomena, both with ultimate reality and with each other, fits well with the ‘t'ong pulgyǒ’ or ‘unitive Buddhism’ of his friend and colleague Wŏnhyo. Ŭisang is also credited with overseeing the construction of numerous temples, contributing to the high achievements of Buddhism in Korea during the first part of the Unified Silla period (668–918).