Nicholas II of Russia
On 1 March 1881, following the assassination of his grandfather, Tsar Alexander II, Nicholas became heir apparent upon his father's ascension as Alexander III. Nicholas and his other family members bore witness to Alexander II's death, having been present at the Winter Palace in Saint Petersburg, where he was brought after the attack. For security reasons, the new tsar and his family relocated their primary residence to the Gatchina Palace outside the city, only entering the capital for various ceremonial functions. On such occasions, Alexander III and his family occupied the nearby Anichkov Palace.
Grand Duke Dmitry Konstantinovich of Russia
On 1 June 1880, Dmitry Konstantinovich was appointed to the suite of Alexander II and given the rank of Fligel-Adjutant. Six months later, after completing his initial infantry training, the grand duke was appointed lieutenant in the Horse Guards Regiment. He was to serve with the Horse Guards for twelve years as a junior officer, and finally as commander.
After completing a training course with the General Staff Academy in 1880, Dmitry Konstantinovich was promoted to Ordnance Officer and scheduled to make his first official appearance, when he would deliver the report as an Imperial Adjutant in the Guards Sappers Cavalry Regiment. The date for his first appearance was Sunday, 1 March 1881. Two hours after the review, his uncle Alexander II, who had been present at the insistence of Alexandra Iosifovna, was assassinated.