The Ministry of War or , sometimes called Tsuwamono no Tsukasaï¼Âé½波æ¯Âä¹Âä¹Âé½å ä½Âï¼Âin Wago, was a division of the eighth century Japanese government of the Imperial Court in Kyoto, instituted in the Asuka period and formalized during the Heian period. The Ministry was replaced in the Meiji period.
The highest-ranking official or was ordinarily a son or a close relative of the Emperor. This important court officer was responsible for directing all military matters; and after the beginning in the late 12th century, this military man would have been empowered to work with the shogunate on the emperor's behalf.
The ambit of the Ministry's activities encompasses, for example:
The ministry was established as part of the Taika Reforms and Ritsuryà  laws which were initiated in the Asuka period and formalized during the Heian period. After 702, the Hyà Âbu-shà  replaced the Hyà Âseikan, which was created in 683.
In the Edo period, titles associated with the ministry became ceremonial titles.
In the Meiji period, the hyà Âbu-shà  was reorganized into a modern Ministry of War and Ministry of the Navy.
The Asuka-, Nara- and Heian-period Imperial court hierarchy encompassed a ministry dealing with military affairs.
In the 18th century, the top ritsuryà  officials within this ministry structure were: