Emperor Maximilian I of Mexico was executed after a reign of only 3 years.

Maximilian (Spanish: Maximiliano; born Ferdinand Maximilian Joseph; 6 July 1832 – 19 June 1867) was the only monarch of the Second Mexican Empire. He was a younger brother of the Austrian emperor Francis Joseph I. After a distinguished career in the Austrian Navy, he accepted an offer by Napoleon III of France to rule Mexico.

The execution of Maximilian of Habsburg together with Generals Miguel Miramon and Tomas Mejia took place on June 19, 1867 in Querétaro, Mexico.
After his execution, Maximilian's body was embalmed and displayed in Mexico. Later, it was taken back to Austria and placed within the Imperial Crypt in Vienna, on 18 January 1868, where it can be viewed today.