Wen Xuan
Li Shan (李善, d. 689) was a student of Cao Xian and a minor official who served on the staff of Li Hong, a Crown Prince of the early Tang dynasty. Li had an encyclopedic knowledge of early Chinese language and literature which he used to create a detailed commentary to the "Wen Xuan" that he submitted to the imperial court of Emperor Gaozong of Tang in 658, though he may have later expanded and revised it with the assistance of his son Li Yong (李邕). Li's annotations, which have been termed "models of philological rigor", are some of the most exemplary in all of Chinese literature, giving accurate glosses of rare and difficult words and characters, as well as giving source information and "loci classici" for notable passages. His commentary is still the recognized as the most useful and important tool for reading and studying the "Wen Xuan" in the original Chinese.