Czar Nicolas Romanov was the last Czar of imperial Russia.
He wasn’t the best leader, he chose at the start of his reign that he would necessarily make all of the decisions in Russia and not have a democratic government, he did many things during his reign that caused for such actions to happen against him and caused the people of the country to demand him to renounce the throne. On the day of his coronation a disaster happened, there were I believe 1642 commoners killed because too many people travelled to a fair set up by Nicolas and his helpers in the family which offered food and drinks to those who went to it first, they didn’t think that so many would show and some commoners got trampled in from the shear size of the people there. That is just one example of his bad leadership, but that even set him up for a bad reign.
He was infamous for his role in pulling Russia out of the air in 1916, causing communism to arise in his country etc.
His family and him were murdered in Yekaterinburg in on the 17th of July 1918 by the Bolsheviks (the communist army) Him, his wife, his four daughters: Olga, Tatiana, Maria and Anastasia: his son Alexei and their dog, were all murmured in the basement of the Ipativ house where they were being kept in by the Bolsheviks. After the abdication of the Czar on the 15th of March 1917 they had been taken to multiple houses by the Bolsheviks and kept and guarded there by them, until they were murdered.
Some of my knowledge may not be perfectly accurate, but hope this helps.