Who formulated the idea of the "principle of legitimacy"?

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The principle of legitimacy was formulated by Klemens von Metternich, an Austrian statesman and diplomat who played a key role in the Congress of Vienna and the restoration of monarchies in Europe after Napoleon's fall. Metternich argued that stability and order could only be achieved by restoring legitimate monarchs to their thrones and suppressing revolutionary movements. He believed that legitimate rulers had a duty to govern justly and maintain the social order, while rebellions and revolutions threatened the peace and prosperity of nations. The principle of legitimacy thus became a cornerstone of conservative political philosophy, which sought to preserve the status quo and resist radical change.

Who Formulated the Idea of the "Principle of Legitimacy