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.
Charles II of England
Charles suffered a sudden apoplectic fit on the morning of 2 February 1685, and died aged 54 at 11:45 am four days later at Whitehall Palace. The suddenness of his illness and death led to suspicion of poison in the minds of many, including one of the royal doctors; however, a more modern medical analysis has held that the symptoms of his final illness are similar to those of uraemia (a clinical syndrome due to kidney dysfunction). In the days between his collapse and his death, Charles endured a variety of torturous treatments including bloodletting, purging and cupping in hopes of effecting a recovery.