Emperor Ninko, the 120th ruler in the traditional Japanese imperial list, was Emperor of Japan from 31 October 1817 to 21 February 1846. He was born on March 16, 1800 in Kyoto, and died there on February 21, 1846, at the age of 45. Emperor Ninko was born as the fourth son of Emperor Kōkaku, and was known as Ayahito before he took the Chrysanthemum Throne. During his reign, he tried to restore certain court forms, for example the emperor was called tennō from then on. During his reign, the decline of the power of the bakufu, i.e. the military government, was already felt, which continued under the reign of his son, Emperor Kōmei, and then his grandson, Emperor Meiji, and finally the bakufu collapsed. Emperor Ninkō's innovations included the creation of the Gakusūso, which prohibited the court nobility, to enter the grounds of the Imperial Palace. In his family, 7 boys and 8 girls were born, but only three children reached adulthood: Emperor Kōmei, Princess Sumiko and Princess Chikako. After the death of Emperor Ninko, he was buried in the imperial mausoleum Nochi no Tsukinova no Higasijama no misasazagi ba, in Kyoto, where several other emperors were buried. and empress also rests. Princess Josikō, the emperor's main wife, was also placed in the mausoleum. Emperor Ninkō's reign fell into the period of the "late Tokugawa Shogunate", which marked the beginning of the decline of the shogun and the bakufu. However, the final fall of the Tokugawa Shogunate did not occur until the Meiji Restoration, when Japan opened up to the West.

Emperor Ninko of Japan, who reigned from 1817 to 1846, was the 120th emperor in the list of traditional Japanese emperors. During his reign, significant changes took place in Japan during the Tokugawa Shogunate. In contemporary Japan, the minting process and the currencies put into circulation were typically under the jurisdiction of the Shogunate, and not directly under the control of the emperor. The currency issued by the shogunate included gold, silver and copper coins of different values. These coins often bore the year of issue, but not necessarily the emperor's name or emblem.