In 738, when TACHIBANA no Moroe was promoted to Udaijin and seized power of the feudal government, Makibi was assigned with an important role along with the priest Genbo who returned from Tang with Makibi, and was appointed Ueji no kami (Guard chief).
738年（天平10年）に橘諸兄が右大臣に任ぜられて政権を握ると、同時に帰国した僧玄ボウとともに重用され、真備は右衛士督の役職を兼ねた。