In this work, we present five essays that reflect on the construction of the idea of ​​liberty based on contextual, historical, and documentary source analysis, particularly from English sources, that Skinner used in its development. In order, they appear: “Thinking about Liberty: A Historian’s Approach,” where Skinner delivers the keynote address for the Balzan Foundation. There, he develops two primary objectives: first, to consider how the concept of liberty might be approached, and second, to promote the publication of his work, *Freedom and the Construction of Europe*, which consists of two volumes: *Religious Freedom and Civil Liberty* and *Free Persons and Free States*. Second, “Liberty as the Absence of Arbitrary Power,” where he provides a historical outline of what has been called the theory of republican liberty. Third, “Classical Liberty, Renaissance Translation, and the English Civil War,” where he masterfully explains the evolution of the distinction between free citizens and slaves through a historical outline that traces the concepts from Imperial Rome to the English Parliament of the 17th century. Fourth, “Rethinking Liberty in the English Revolution,” in which he presents a new approach to the debate between the Crown and Parliament regarding political liberty. Finally, and fifth, “States and the Liberty of Citizens,” in which he develops a central question: what is the scope of the legitimate power of the State over its citizens? Or, as he himself puts it, what is the scope of the liberty and rights of citizens within the State? Each and every one of the above sections was selected by the author himself for this publication.