Umaosa was furyu, a divine dance performed by a child who rode on a horse dedicated by the Imperial Court, that was held in goryoe (a spirit-pacifying ceremony) of the Yasaka-jinja Shrine.
馬長は祭礼において朝廷などが寄進した馬に乗る役目をもった風流で、八坂神社の御霊会などで行われていた。