Heart Sutra
Two commentaries of the Heart Sutra were composed by pupils of Xuanzang, Woncheuk and Kuiji, in the 7th century. These appear to be the earliest extant commentaries on the text. Both have been translated into English. Both Kuījī and Woncheuk's commentaries approach the Heart Sutra from both a Yogācāra and Madhyamaka viewpoint; however, Kuījī's commentary presents detailed line by line Madhyamaka viewpoints as well and is therefore the earliest surviving Madhyamaka commentary on the Heart Sutra. Of special note, although Woncheuk did his work in China, he was born in Silla, one of the kingdoms located at the time in Korea.