Ritsuryō (律令; Japanese: [ɾi.tsɯ.ɾʲoː, ɾi.tsɯ.ɾei, ɾi.tsɯ.ɾeː]) is the historical legal system based on the philosophies of Confucianism and Chinese Legalism in Feudal Japan. The political system in accord to Ritsuryō is called "Ritsuryō-sei" (律令制). Kyaku (格) are amendments of Ritsuryō, Shiki (式) are enactments.
Ritsuryō defines both a criminal code (律, Ritsu) and an administrative code (令, Ryō).
Fudoki (風土記) are ancient reports on provincial culture, geography, and oral tradition presented to the reigning monarchs of Japan, also known as local gazetteers. They contain agricultural, geographical, and historical records as well as mythology and folklore. Fudoki manuscripts also document local myths, rituals, and poems that are not mentioned in the Kojiki and the Nihon Shoki chronicles, which are the most important literature of the ancient national mythology and history. In the course of national unification, the imperial court enacted a series of criminal and administrative codes called ritsuryō and surveyed the provinces established by such codes to exert greater control over them.
Provinces of Japan (令制国, Ryōseikoku) were first-level administrative divisions of Japan from the 600s to 1868.
Provinces were established in Japan in the late 7th century under the Ritsuryō law system that formed the first central government. Each province was divided into districts (郡, gun) and grouped into one of the geographic regions or circuits known as the Gokishichidō (Five Home Provinces and Seven Circuits). Provincial borders often changed until the end of the Nara period (710 to 794), but remained unchanged from the Heian period (794 to 1185) until the Edo period (1603 to 1868). The provinces coexisted with the han (domain) system, the personal estates of feudal lords and warriors, and became secondary to the domains in the late Muromachi period (1336 to 1573).
Gokishichidō (五畿七道; "five provinces and seven circuits") was the name for ancient administrative units organized in Japan during the Asuka period (AD 538–710), as part of a legal and governmental system borrowed from the Chinese. Though these units did not survive as administrative structures beyond the Muromachi period (1336–1573), they did remain important geographical entities until the 19th century.The Gokishichidō consisted of five provinces in the Kinai (畿内) or capital region, plus seven dō (道) or circuits, each of which contained provinces of its own.
When Hokkaido was included as a circuit after the defeat of the Republic of Ezo in 1869, the system was briefly called Gokihachidō (五畿八道; "five provinces and eight circuits"). The abolition of the han system abolished the -han (early modern feudal domains) in 1871, -dō/circuits and provinces were per se not abolished by the abolition of domains; but the prefectures that sprang from the domains became the primary administrative division of the country and were soon merged and reorganized to territorially resemble provinces in many places. "Hokkai circuit" (Hokkai-dō) was the only -dō that would survive as administrative division, but it was later increasingly treated as "Hokkai prefecture" (Hokkai-dō); finally after WWII, the -dō was fully regarded as a prefecture: from 1946, the prefectures (until then only -fu/-ken) were legally referred to as -dō/-fu/-ken, from 1947 as -to/-dō/-fu/-ken.
The Daijō-kan or Dajō-kan (Japanese: 太政官), also known as the Great Council of State, was (i) (Daijō-kan) the highest organ of Japan's premodern Imperial government under the Ritsuryō legal system during and after the Nara period or (ii) (Dajō-kan) the highest organ of Japan's government briefly restored to power after the Meiji Restoration, which was replaced by the Cabinet. In Yamato name it is also called "Ōmatsurigoto-no-Tsukasa" 於保伊萬豆利古止乃官）.
It was consolidated in the Taihō Code of 702. The Asuka Kiyomihara Code of 689 marks the initial appearance of this central administrative body composed of the three ministers—the Daijō-daijin (Chancellor), the Sadaijin (Minister of the Left) and the Udaijin (Minister of the Right).
Kokushi (国司; also read Kuni no tsukasa) were provincial officials in Classical Japan. They were nobles sent from the central government in Kyoto to oversee a province, a system that was established as part of the Taika Reform in 645, and enacted by the Ritsuryō system. There were four classes of kokushi, from the highest to the lowest: Kami (守), Suke (介), Jō (掾), and Sakan (目). In the Middle Ages, an acting governor called mokudai, the daikan of the kokushi, took over the local government of the province, while the kokushi returned to the capital to take on a supervising role.
Kugyō (公卿) is the collective term for the most important officials attached to the court of the Emperor of Japan in pre-Meiji eras. The term generally referred to the Kō (公) and Kei (卿) court officials and denoted a court rank between First Rank and Third Rank under the Ritsuryō system, as opposed to the lower court nobility, thus being the collective term for the upper court nobility. However, later on some holders of the Fourth Rank were also included.
In 1869, following the Meiji Restoration, the court nobility and daimyo were merged into a new peerage, the kazoku.