In March 1868, the emperor announced the Charter Oath of Five Articles which laid out the new political principles and, in September of the same year, the era name was changed to Meiji (while the change of era name retroactively became effective as of January 1 of that year by the lunar calendar).
1868年3月に五箇条の御誓文によって新しい政治方針を示し、同年9月には年号を明治と改めた（改元は同年1月1日に遡って適用）。