Short answers, pulled from the story.
Ivan IV became the first Russian ruler to be formally crowned as Tsar of All Russia on the 16th of January 1547. This event marked a turning point in Russian history when Muscovite rulers transitioned from holding titles like Grand Prince to receiving full imperial ceremony.
Legend claims the fourteenth-century gold filigree cap trimmed with sable fur originated from Byzantine emperor Constantine IX. Modern scholarship suggests the diadem actually originated in Asia rather than Constantinople, yet it remained the standard headgear for Russian rulers from Dmitri Donskoi until Peter the Great replaced it in 1721.
Court jewelers Ekhart and Jérémie Pauzié created the Great Imperial Crown for Catherine II in 1762 using a mitre design divided into two half-spheres. The masterpiece featured diamonds and a massive 398.72-carat red spinel sourced from China while weighing only 2.3 kilograms.
A crush trampled 1,389 persons to death during celebrations near Khodynka Field where inexpensive souvenirs were distributed freely to common people. Rumors spread that there were not enough mementos available for everyone present in the massive crowd, resulting in a disaster that marred the festivities surrounding the last coronation of a Russian Tsar.
Ivan III claimed the title Grand Prince of All Russia before his grandson Ivan IV became the first formally crowned Tsar of All Russia on the 16th of January 1547. Peter I later adopted the formal title Emperor during his reign though common usage continued assigning the title Tsar to Russian monarchs until the dynasty ended in 1917.