In 1913, as festivities were planned for the wedding of Kaiser Wilhelm II’s daughter, Berlin’s Hotel Adlon had to move the Kaiser’s brother-in-law from the fourth floor to the second because the tsar could not ride the elevator:
Russian court protocol governed every step the tsar took and nowhere did it mention an elevator. Thus there were no instructions for how the tsar and his retinue were to behave in such a situation. Should he enter the cab first? Was he permitted to keep his hat on? Who should operate the elevator’s crank? and God knows what else.
The protocol had survived unchanged from the days of Catherine the Great. Catherine, of course, had never ridden an elevator for the simple reason that there weren’t any back then, and that’s why the protocol contained not one word about this means of vertical transportation. … At any rate, an apartment on the second floor was prepared for Duke Ernst Gunther zu Schleswig-Holstein.
From Andreas Bernard, Lifted: A Cultural History of the Elevator, 2014.