The Foundation for the Reizei family's Shigure-tei library was founded by the descendants of FUJIWARA no Teika; it was created both to store and protect the cultural treasures, including old manuscripts, architectural items, and reports of annual events that had been passed down in the Reizei family, which was well known as a poetic family, and for the purpose of instructing succeeding generations in the Reizei school of kokin denju, or interpretation of the poetry in the Kokinshu.
財団法人冷泉家時雨亭文庫（れいぜいけしぐれていぶんこ）は、藤原定家の子孫であり、歌道の家として知られる冷泉家（上冷泉家）に伝わる古写本、建築、年中行事などの文化遺産を保存し、冷泉流古今伝授を継承することを目的として設立された。