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.
Barbary macaque
King Alexander of Greece (1893-1920) was famously killed from the results of an attack by a Barbary Macaque. On 2 October, 1920, Alexander, strolling through his gardens while walking his dog, was attacked by a macaque following a fight between his dog and another monkey. He was bit on the leg and torso, before servants chased the animals away. He wounds became infected and Alexander, not wanting the event to be publicised, was not properly treated. He died of sepsis on 25 October.