Liberty's development stems from two main historical threads. The first is the Enlightenment's critique of inherited authority, demanding justification through reason. The second is an older realist tradition, tracing thinkers from Aristotle through Mises and Rothbard, who believed in an intelligible order with a structured human action and inherent limits on political power. This realist tradition focuses on causal structures, contrasting with constructivism's belief in deliberate design. Constructivism, exemplified by the "fatal conceit," erroneously assumes humans can fully shape the world to their will. The danger arises when criticism hardens into confidence in consciously designed institutions. The older lineage begins by observing human beings and their natural tendencies, with laws deriving their justice from principles beyond mere command. Spanish Scholastics extended this to economics, linking just prices to market conditions and limiting arbitrary political intervention. Richard Cantillon highlighted entrepreneurship and uncertainty in market price formation. Carl Menger shifted focus to individual needs and subjective value, tracing market phenomena to individual judgments. Böhm-Bawerk analyzed capital and time in production processes. Mises, through praxeology, generalized this by focusing on the acting individual as the basis for economics. He demonstrated socialism's failure due to the lack of genuine exchange and monetary calculation for capital goods. Rothbard systematically extended this lineage to political conclusions, grounding his work in natural law and rights. He restored neglected thinkers to economic history, critiquing the dominance of British classical economics. The administrative state exemplifies the separation of Enlightenment ideals from inherent limits, leading to managerial control disguised as liberalism. Ultimately, liberty's history is the convergence of challenging authority and recognizing the limits imposed by human action and economic realities.