The Tsar (or czar) Nicholas II.
Czar Nicholas II
The tsars had enjoyed unlimited power in Russia. Only Nicholas II had to deal with a revolution, which forced him to abdicate.
It was the German Revolution that forced Kaiser Wilhelm II to abdicate his imperial crown in 1919. The German Revolution began in 1918, and ended 9 months later in 1919.
He didn't abandon the crown. He was captured and forced to step down from power.
The equivalent in history is when the Bolsheviks forced the Czar to abdicate his throne.
Most people call it the Russian Revolution-- maybe there is a less obvious name for it. The February Revolution of 1917 is the one which forced the Czar to abdicate. It is also sometimes called the Patriotic Revolution. The October, or Bolshevik Revolution, is the one which overthrew the Provisional Government which replaced the Tsar upon his abdication.
At the end of World War I, Kaiser Wilhelm was forced to abdicate. The king refused to abdicate, and was dethroned and imprisoned by his generals.
His military defeat at Waterloo.
Alexander Kerensky was the Russian Prime Minister who was forced to resign as a result of the Russian Revolution (and who died in exile). Czar Nicholas II had already abdicated, prior to the revolution (but was executed anyway by the vengeful Bolsheviks).
Nicholas II of Russia .
The February Revolution of 1917
Odoacer forced the last Roman emperor of the west to abdicate.Odoacer forced the last Roman emperor of the west to abdicate.Odoacer forced the last Roman emperor of the west to abdicate.Odoacer forced the last Roman emperor of the west to abdicate.Odoacer forced the last Roman emperor of the west to abdicate.Odoacer forced the last Roman emperor of the west to abdicate.Odoacer forced the last Roman emperor of the west to abdicate.Odoacer forced the last Roman emperor of the west to abdicate.Odoacer forced the last Roman emperor of the west to abdicate.