The Taishou era (大正時代 Taishō jidai, lit. "Age of Great Righteousness") is the official name of the era of Japanese history spanning from July 30th, 1912, to December 25th, 1926.
Coinciding with the reign of Emperor Taishō, it was a time of political change in Japan towards democracy and liberalism, distinguished from the hasty modernization and westernization of the preceding Meiji era, and the rise and domination of ultra-nationalistic militarism of the early Shouwa era.
