21 April (2 May), 1729 in the German city of Stettin (now Szczecin, Poland) was born Sophie Auguste von Anhalt-Zerbst, the future Russian Empress Catherine II.
On April 21 (May 2), 1785 Catherine II signed two legislative acts: ‘Charter of rights, liberties and benefits of the Russian nobility’ and ‘Charter of rights and advantages for the cities of the Russian Empire’.
April 20 (May 2) 1873, in the locality of Urdo Agha, Trans-Baikal region of Chita County, in a nomad Buryat family of Tsebek Montuyev, was born Gombojab Tsebekovich Tsybikov, future orientalist, professor, traveler.