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(Japanese: 家 督 (か と く) Katouku) is a term used in Japanese history to mean the highest authority under the patriarchal system. In the Kamakura period, it was the principle that the deficit was inherited solely by the deficit, but the inheritance was inherited partly. In the Muromachi period, it was the principle that the deficit and inheritance were all inherited, but in reality, the system was not fully established, and the internal affairs frequently occurred within each family around the succession of grammar. In the Edo era, the principle of inheritance of the deficit of singing was established based on the absolute power of the shogunate. In addition, it expresses that the name of a separated family is inherited by a person of other surname, and it is distinguished from the readability inheritance in the case of inheritance of a parent or kin. A major example is the inheritance of Taira Hatakeyama by Minamoto Yoshizumi Ashikaga, who changed to Hatakeyama Minamoto Castle.