However, judging from the fact that the post of Junnain betto was created in 881 and Shogakuin itself was founded in the same year, it is presumed that either MINAMOTO no Toru, who was then the highest-ranking court noble among the people of Saga-Genji as well as the whole of Minamoto clan, or his son MINAMOTO no Noboru was the first person who concurrently assumed the betto of both schools and Genji choja.
ただ、淳和院への別当設置と奨学院そのものの設置はともに元慶5年（881年）のことであり、当時の嵯峨源氏及び源氏全体の筆頭公卿であった源融またはその子の源昇が両院別当と源氏長者を兼ねた最初の人物であったと推定されている。