His father, Minamoto Tomitsu was highly skilled in both literary and military arts.
[3][4] Three generations after Sadamune, Ogasawara Nagahide wrote the first manual of courtly etiquette, the Sangi Itto in 1380, after inheriting his father's post.
[6] In the 1960s, Tadamune Ogasawara laid claim to the inheritance of the ryū's teachings on formal etiquette, and introduced these elements to the public for the first time.
[citation needed] The Ogasawara school laid the foundations for etiquette for the samurai class of Japan.
These rules and practices covered bowing (the school's teachings describe nine different ways of performing a bow[5]), eating,[9] marriage[10] and other aspects of everyday life, down to the minutiae of correctly opening or closing a door.