Hyujong（1520-1604）; a Choson dynasty Son monk who can be counted among the five most important figures in Korean Buddhist history; commonly known in Korea by the respectful title Sosan Taesa 西山大师. He was an influential teacher and writer， who is said to have guided hundreds of students， a number of whom turned into Son masters in their own right. He played a major role in consolidating the forms of study and practice of Korean Son which would， by and large， remain in place down to modern times. What has made Hyujong most respected in the broad view of Korean history was his role in the creation and guidance of an army of monks， which played a decisive role in the eventual repulsion of the Japanese invasion by the armies of Hideyoshi Toyotomi 秀吉礼臣.
In addition to serving in this unusual capacity of military leader， Sosan was a first-rate Son master and the author of a number of important religious texts， the most important of which is his Songa kwigam 禅家龟鑒， a guide to Son practice which is studied by Korean monks down to the present. Like most monks of the Choson period， he had been initially educated in Neo-Confucian philosophy. Dissatisfied， he wandered through the mountain monasteries， eventually joining the sangha. Later， after making a name for himself as a teacher， he was made arbiter of the Son school by queen Munjong. He soon resigned from this responsibility， returning to the itinerant life， advancing his Son studies and teaching at monasteries all around Korea. He died at 85， leaving behind some 1000 disciples， 70 of whom were monks and nuns， and many of whom held a prominent role in the later transmission of Choson Buddhism.
Hyujong is also known for his efforts in the continuation of the project of the unification of Buddhist doctrinal study and practice. He is considered the central figure in the revival of Choson Buddhism， and most major streams of modern Korean Son trace their lineages back to him through one of his four main disciples: Yujong 惟政; Ongi 彦机， T'aenung 太能 and Ilson 一禅， all four of whom were assistants to Sosan during the war with Japan.