The Classical Theory of the Separation of Powers By
Montesquieu and Locke
Metin Garayev
Abstract. The theory of separation of powers is considered one of the fundamental pillars of modern constitutional statehood. Its main objective is to prevent the concentration of power in a single authority and to establish a system of checks and balances in governance. Two key philosophers who significantly contributed to the development of the classical model of separation of powers were John Locke and Charles-Louis Montesquieu. Locke introduced the idea of separating governmental powers within the framework of liberal natural law philosophy, distinguishing between legislative, executive, and federative powers. Montesquieu further developed this concept in a more systematic and comprehensive manner by formulating the classical tripartite model: legislative, executive, and judicial powers. This article analyzes Locke’s contribution as an early theoretical foundation and Montesquieu’s role in shaping the classical doctrine of separation of powers. A comparative analysis of their views is provided, alongside an examination of how this doctrine functions in modern democratic systems, including its mechanisms and practical challenges. The study concludes that while Locke laid the conceptual groundwork, Montesquieu transformed these ideas into a coherent political-legal doctrine and is therefore recognized as the principal architect of the classical theory of separation of powers.
Keywords: separation of powers, constitutionalism, legislative power, judicial power, classical model