What did the nobles of ancient Japan do?

They are all the world's secretary of the world's salary, the official position is hereditary, belonging to a certain family name family, and some are also relatives of the emperor, this kind of people constitute Japan's official class, they do not engage in production, the needs of the emperor and the central government to provide, the daily only know how to be attached to the elegance of the world, and no fiefdom. However, the official positions of the state had to be held by this kind of aristocrats with noble blood, and because of the respect for literature, the aristocrats in ancient Japan were also the main intellectuals such as literary creators and painters, etc. However, since the Kamakura Shogunate, the authority of the emperor was under attack, and the samurai class with actual fiefdoms rose, the power and wealth of the state were mostly in the hands of the shoguns and feudal lords, and the aristocracy of the public officials became the puppets of the samurai. official puppets, only an empty shelf.