twelve imperial coinages of Nara and Heian Japan
Historical term referring to the twelve types of coins minted under imperial order from the late 7th to the 10th century, including the Wadōkaichin and others.
The twelve imperial coinages are ancient Japanese currencies, starting with the Wadōkaichin.
From 皇朝 (imperial dynasty) + 十二 (twelve) + 銭 (coin). The term refers to the twelve types of coins minted by the imperial court during the Nara and Heian periods.