Emperor Taishō was the 123rd ruler of Japan, reigning from 1912 to 1926. His personal name was Yoshihito, and during his reign Japan continued to modernize its economy. Yoshihito was proclaimed Crown Prince on November 3, 1889, following the death of his two older brothers. He ascended the throne on July 30, 1912. Emperor Taishō was sickly as a child, and his political role was almost negligible. He became mentally disturbed in his later years, and his son, Crown Prince (later Emperor) Hirohito was appointed Prince Regent in 1921. During his reign, known as the Taishō era, Japan's foreign policy was friendly to Western powers, especially Great Britain and the United States of America. Domestically, parliamentary procedures were increasingly used and the right to vote was broadened. More voters were drawn in by reducing the right to vote for tax liability, and it was completely abolished in 1925. During the Taishō era, inter-party politics flourished and laws favorable to workers were passed. Japan continued to pressure China for economic and political concessions and concluded treaties with Western countries that recognized its interests in Korea, Manchuria, and the rest of China. The economic crisis at the end of the Taishō period caused much suffering in rural Japan. The emperor lived in seclusion due to his health and died of a heart attack in Hayama on December 25, 1926, aged 47, after battling pneumonia. She was succeeded by her son, Emperor Hirohito. Sadako Kujo (九条節子, Sadako Kujo, June 25, 1884 - May 17, 1951) was the wife of Emperor Taisho and the mother of Emperor Sowa of Japan.

During the reign of the Japanese Emperor Taishō, from 1912 to 1926, many important changes took place in Japanese coinage. In 1914, after the outbreak of World War I, the Japanese government stopped issuing silver coins. This decision was due to the fact that the price of silver rose significantly during the war and the government could not ensure the stability of the value of silver coins. In 1917, the Japanese government reduced the value of gold coins. This decision was also related to the First World War, as the price of gold rose significantly during the war. Thanks to the change, the value of 1 yen of gold was reduced to 200 sen instead of 250. During Taishō's reign, silver coins worth 10 sen were introduced, as well as gold coins worth 1 and 5 yen. Copper coins continued to play an important role in the Japanese monetary system. Coinage during the Taishō period was significant had an impact on the Japanese economy. Ending the issue of silver coins and reducing the value of gold coins helped to maintain the stability of the Japanese monetary system. And the introduction of new coins helped to modernize the Japanese economy.