If you are referring to seizing a throne or kingship by force the term is Usurping. So the person would be a Usurper of the throne. Hope that helps... Otherwise there is of course overthrow or replace. But Usurp is the proper term.
The typical term is 'coup d'etat'.
If you tighten that any tighter, it will seize up. "Seize this!", shouted the captain to the pirate vessel.
The verb for seizure is seize As in "to seize something".
The word seize is a verb (seize, seizes, seizing, seized). Noun forms for the verb are seizer, one who seizes. Another noun form is seizure.
Grab, Seize
take
greece
In September 1917
Iran
The Bolsheviks did not seize power during the Russian Civil War. They had already seized governmental power from the Provisional Government in 1917. The civil war is generally figured to have started in 1918. The Bolsheviks managed to retain their power, not seize it, by winning the civil war.
1976
usurp
To adopt, Seize power, or invade.<(-_-)>
A revolt designed to overthrow an existing government and seize power
Iran.
Usually (but not necessarily) by force. But in any event, not by statutorily legal lines of succession.
You must seize power of a country and set up a monarchy, in which you are king.
The military in Paris under his control seized the government.