He was the founder of the Ogasawara school of the Japanese horse-back archery technique, and he was the founder of the Ogasawara clan to which the position of the Shinano no kuni no kami (the Governor of the Shinano Province) was granted.
弓馬術礼法小笠原流の祖であり、信濃国守護家小笠原氏の祖。