Abolitions
King Constantine II of Greece reigned from 1963 until the abolition of the Greek monarchy in 1973.
King Humbert II of Italy reigned for only a few weeks in 1946 before the abolition of the Italian Monarchy.
Tsar Nicholas II of Russia reigned from 1894 to 1917 during the Russian Revolution when he was forced to abdicate and the Russian Empire was overthrown.
King Louis XVI of France reigned from the 1770s until the overthrow of the monarchy in 1792 and his execution the following year.
Shah Mohammad Reza Pahlavi of Iran reigned for more than 37 years (1941–1979) until he fled during the Iranian Revolution, which replaced 2500 years of monarchy with the Islamic Republic of Iran. The Shah died the following year and is buried in Cairo.
Read more about this topic: Reign, Regnal Periods