What is "uicheon"

Uicheon (28 September 1055 – 5 October 1101) was a Korean Buddhist monk who founded the Cheontae school of Buddhism. He was the son of King Munjong of Goryeo. He lived at Ryongtongsa in Kaesong for much of his life and was buried there, where his tomb can be found today.

From 1073 to 1090 he collected Tripiṭaka commentaries from Korea, China, the Khitan Empire and Japan, which were published as the "Goryeo Catalog of Sutras" (or "Goryeo Supplement to the Canon").

Guksa was his title (‘National Preceptor’), while Daegak was his posthumous Dharma name, meaning "Grand Enlightenment".