Grand Duke Sergei Alexandrovich of Russia (Сергей Александрович; 11 May 1857 – 17 February 1905) 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 Elizabeth, the sister of Tsarina Alexandra. Grand Duke Sergei Alexandrovich started a military career early in his life. He was from birth Colonel-in-Chief of the 38th Tobolsk Infantry Regiment, he also became Colonel-in-Chief of the 2nd Battalion Guards Rifles and, towards the end of his life, Colonel-in-Chief of the 5th Kievsky Grenadier Regiment. On his twentieth birthday on 29 April 1877, the Grand Duke took the solemn oath of allegiance to the Emperor. An educational tour that had been proposed for him was postponed upon the outbreak of the Russo-Turkish War of 1877–78. Sergei took part in the war with his father and brothers, the Tsarevich Alexander and Grand Dukes Vladimir and Alexei. He spent the greater part of his time serving as Poruchik in the Leib Guard under the Tsarevich in southeast Romania. He was consequently promoted to Colonel. On 12 October, following the battle of Meyk, the Emperor decorated him with the Order of St George, for courage and bravery in action with the enemy, for a reconnaissance expedition at Kara Loma near Koshev. At the end of December 1877, Sergei Alexandrovich returned to Saint Petersburg with his father.
On 15 February 1905 the family of Grand Duke attended a concert at the Bolshoi Theatre in aid of Elizabeth Feodorovna's Red Cross War charities. A terrorist organization that knew his route, the Socialist Revolutionary Party's combat detachment, had planned to assassinate him that day. However, one of their members, Ivan Kalyayev, noticed the children in the carriage and decided to call off their attack. To kill the Grand Duchess and the children would surely have sparked a wave of apprehension throughout the empire, and would have set back the revolutionary cause by years. Having had lunch with his wife at Nicholas Palace on 17 February, Sergei left unaccompanied for the Governor General's mansion. Because of the looming threat, Sergei had refused to take his adjutant, Alexei, since he was married and a father. The arrival of the Grand Duke's recognizable carriage, drawn by a pair of horses and driven by his coachman Andrei Rudinkin, alerted the terrorist who had been waiting in the Kremlin with a bomb wrapped in newspapers.
Just before 14:45, the carriage of the Grand Duke passed through the gate of Nikolskaya Tower of the Kremlin and turned the corner of the Chudov Monastery into Senatskaya Square. From a distance no more than four feet (1.2 m) away and still some 60 feet (18 m) inside the Nikolsky Gate, Ivan Kalyayev stepped forward and threw a nitroglycerin bomb directly into Sergei's lap. The explosion disintegrated the carriage and the Grand Duke died immediately. Scattered all over the bloodstained snow lay pieces of scorched cloth, fur, and leather. The body of the Grand Duke was mutilated, with the head, the upper part of the chest, and the left shoulder and arm blown off and completely destroyed.
