Shosai-Ki' (essays of SUGAWARA no Michizane) in "Kanke bunso" (an anthology of Chinese-style poetry by SUGAWARA no Michizane) described: There was a study of about nine square meters in the southwest corner of the private residence of the Sugawara clan (the residence was called Kobai-Den (red plum blossom residence) in later ages. The residence was likened to Kita kandaijin-jinja Shrine in the present Shimogyo Ward of Kyoto City); The study had produced many monjosho (student of literary studies in the Japanese Imperial University) and Monjo tokugosho (Distinguished Scholars of Letters); and The name of the residence was Sanin-tei.
『菅家文章』の「書斎記」によれば、菅原氏の私邸（後世にて「紅梅殿」と称された。現在の京都市下京区の北菅大臣神社に比定される）の西南に一丈四方の書斎があり、そこから多くの文章生・文章得業生を輩出したこと、その名称が山陰亭であったことを伝えている。