Omi Code
Encyclopedia
The are a collection of governing rules compiled in 668AD, hence being the first collection of Ritsuryō
Ritsuryo
is the historical law system based on the philosophies of Confucianism and Chinese Legalism in Japan. The political system in accord to Ritsuryō is called "Ritsuryō-sei"...

 laws in classical Japan. These laws were compiled by Fujiwara no Kamatari
Fujiwara no Kamatari
Fujiwara no Kamatari was a Japanese statesman, courtier and politician during the Asuka period.Kamatari was the founder of the Fujiwara clan in Japan. His birth clan was the Nakatomi. He was the son of Nakatomi no Mikeko, and his birth name was Nakatomi no Kamatari...

 under the order of Emperor Tenji
Emperor Tenji
, also known as Emperor Tenchi, was the 38th emperor of Japan, according to the traditional order of succession.Tenji's reign spanned the years from 661 through 671.-Traditional narrative:...

.
This collection of laws is now lost and its disputed existence is supported only by short references in later documents (among which the Tōshi Kaden
Toshi Kaden
, commonly abbreviated as Kaden, is a Japanese biographical record of the Fujiwara clan. Compiled by Fujiwara no Nakamaro and Enkei, it was completed between 760 and 766. It is two volumes in length.-Contents:...

, a history of the Fujiwara).
It is furthermore missing from the Nihon Shoki
Nihon Shoki
The , sometimes translated as The Chronicles of Japan, is the second oldest book of classical Japanese history. It is more elaborate and detailed than the Kojiki, the oldest, and has proven to be an important tool for historians and archaeologists as it includes the most complete extant historical...

.

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
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...

of 689; and these are understood to have been a forerunner of the Taihō ritsu-ryō of 701.
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