Sanin-tei was a private school kept by the Sugawara clan, that had produced Monjo hakase (professor of literature) for three generations; SUGAWARA no Kiyokimi, SUGAWARA no Koreyoshi, and SUGAWARA no Michizane, during the early Heian period.
山陰亭（さんいんてい）とは、平安時代前期に菅原清公・菅原是善・菅原道真と3代にわたって文章博士を輩出した菅原氏の私塾のこと。