The Russian Constitution of 1906 is adopted (on April 23 by the Julian calendar).

The Russian Constitution of 1906 refers to a major revision of the 1832 Fundamental Laws of the Russian Empire, which transformed the formerly absolutist state into one in which the emperor agreed for the first time to share his autocratic power with a parliament. It was enacted on 6 May [O.S. 23 April] 1906, on the eve of the opening of the first State Duma. This first-ever Russian Constitution was a revision of the earlier Fundamental Laws, which had been published as the Code of Laws of the Russian Empire in 1832. It was granted during the Russian Revolution of 1905, in a last-ditch effort by the imperial government to preserve its own existence and keep the empire from disintegration.

The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year. The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts of Oriental Orthodoxy as well as by the Amazigh people. For a quick calculation, between 1901 and 2099 the much more common Gregorian date equals the Julian date plus 13 days.