Asuka Kiyomihara Code

The refers to a collection of governing rules compiled and promulgated in 689, one of the first, if not the first collection of Ritsuryō laws in classical Japan. This also marks the initial appearance of the central administrative body called the "Daijō-kan" (Council of State) composed of the three ministers—the "Daijō-daijin" (Chancellor), the "Sadaijin" (Minister of the Left) and the "Udaijin" (Minister of the Right).
In 662, Emperor Tenji is said to have compiled the first Japanese legal code known to modern historians. The Ōmi-ryō, consisting of 22 volumes, was promulgated in the last year of Tenji's reign. This legal codification is no longer extant, but it is said to have been refined in what is known as the Asuka Kiyomihara "ritsu-ryō" of 689. The compilation was commenced in 681 under Emperor Tenmu. The Emperor died in 686, but the finalization of the Code took a few more years. It was promulgated in 689. These are understood to have been a forerunner of the "Taihō ritsu-ryō" of 701.
Although not "finalized" (not incorporating a penal code, a "ritsu", for instance), the code already incorporated several important regulations (for instance compulsory registration for citizens), which paved the way for the more complete Taihō Code.