During the rule of Emperor Godaigo, the 7th generation Sadamune OGASAWARA (from the school of manners) and Tsuneoki (常興) OGASAWARA (from the school of horseback archery) authored "Shushinron (moral training theory)" and "Taiyoron (theory about how to deal with our bodies)", respectively, laying the foundations for the modern Ogasawara-ryu.
その後後醍醐天皇の時代には七代小笠原貞宗（礼法家）と小笠原常興（弓馬術礼法家）、が『修身論』と『体用論』をまとめ、今の小笠原流の基礎を築いている。