Separation of powers is a political doctrine originating in the writings of Charles de Secondat, Baron de Montesquieu in The Spirit of the Laws, in which he argued for a constitutional government with
The United States Capitol dome as seen from the Supreme Court Building
Grover Cleveland worked to restore power to the Presidency after Andrew Johnson's impeachment.
Montesquieu
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Charles Louis de Secondat, baron de La Brède et de Montesquieu, generally referred to as simply Montesquieu, was a French jurist, historian, and political philosopher.
Separation of powers under the United States Constitution
…Separation of powers is a political doctrine originating in the writings of Charles de Secondat, Baron de Montesquieu in The Spirit of the Laws, in which he argued for a constitutional government with three separate branches, each of which would have defined authority…
Portrait by an anonymous artist, c. 1753–1794
Château de la Brède, Montesquieu's birthplace
Montesquieu's 1748 De l'Esprit des loix
Montesquieu on the 200 French franc note