The concept of political legitimacy evolves as societal norms, values, and expectations change over time. Initially grounded in social contracts or historical precedents, legitimacy can shift due to factors like popular dissent, political reform, or cultural transformations. Modern legitimacy often relies on the principles of democracy, governance, and rule of law, where the consent of the governed is paramount. Leaders must adapt to new demands for accountability and responsiveness, particularly in democratic contexts. Failure to maintain legitimacy can lead to political upheaval or, in extreme cases, regime change.