Explore the foundations of legal philosophy through a comprehensive video lecture that delves into John Austin's habit- and sanction-based theory of law. Examine the behaviorist approach to legal theory through a step-by-step analysis of a simple gunman scenario. Gain insights into the concepts of internal supremacy and external independence, which form the core of Austin's conception of sovereignty. Follow the lecture's structured syllabus, covering topics from the introduction to the Concept of Law, through Naturalism and Behaviorism, to the various modifications of Austin's theory, including promulgation, efficacy, and the final modifications addressing internal supremacy and external independence.