Russian Revolution of 1905: Grand Duke Sergei Alexandrovich of Russia is assassinated in the Moscow Kremlin by Socialist Revolutionary Ivan Kalyayev.

The Russian Revolution of 1905, also known as the First Russian Revolution, was a revolution in the Russian Empire which began on 22 January 1905 and led to the establishment of a constitutional monarchy under the Russian Constitution of 1906, the country's first. The revolution was characterized by mass political and social unrest including worker strikes, peasant revolts, and military mutinies directed against Tsar Nicholas II and the autocracy, who were forced to establish the State Duma legislative assembly and grant certain rights, though both were later undermined.

Grand Duke Sergei Alexandrovich of Russia was the fifth son and seventh child of Emperor Alexander II of Russia. He was an influential figure during the reigns of his brother Emperor Alexander III of Russia and his nephew Emperor Nicholas II, who was also his brother-in-law through Sergei's marriage to Elisabeth, the sister of Empress Alexandra.

The Moscow Kremlin is a fortified complex in Moscow, Russia. Located in the centre of the country's capital city, the Moscow Kremlin comprises five palaces, four cathedrals, and the enclosing Kremlin Wall along with the Kremlin towers. In the complex is the Grand Kremlin Palace, which was one of the royal residences of the Tsar of Russia, and now is the residence of the president of the Russian Federation. The Moscow Kremlin overlooks the Moskva River to the south, Saint Basil's Cathedral and Red Square to the east, and Alexander Garden to the west.

The Socialist Revolutionary Party was a major socialist political party in the late Russian Empire, during both phases of the Russian Revolution, and in early Soviet Russia. The party members were known as Esers.