The influential philosopher known for his thoughts on liberty and government is John Locke. Locke, active during the 17th century, is often regarded as a foundational figure in liberal political philosophy. He advocated for the idea of natural rights, including life, liberty, and property, asserting that government is formed through the consent of the governed to protect these rights. His work, particularly "Two Treatises of Government," profoundly influenced the American and French revolutions, promoting democratic principles and individual freedoms. Locke’s theories also laid the groundwork for modern democratic thought and constitutional governance.