The Toin family belonged to the court nobility of the Dojo family of Kanin-ryu (the Kanin family) of the Northern House of the Fujiwara clan, which existed from the Kamakura period to the Muromachi period.
洞院家（とういんけ）は、鎌倉時代から室町時代にかけて存在した藤原北家閑院流の堂上公家。