The Ichijo Family was the legitimate blood of Kujo-ryu during the Kamakura era, but after the middle Muromachi period the position of the Kujo Family was elevated and the Ichijo and Kujo families were considered to be the legitimate blood of Kujo-ryu.
鎌倉時代は一条家が九条流の嫡流であったが、室町中期以降、九条家の地位が上昇し、一条家、九条家が九条流の嫡流とされた。