Within the depth-psychology corpus, Marcus Aurelius functions as a cardinal exemplar of the philosopher-ruler who submits his inner life to sustained, disciplined scrutiny — a figure whose significance extends well beyond Stoic doctrine into broader questions about self-transformation, spiritual exercise, and the psychology of the examined life. Pierre Hadot’s repeated engagements with the Meditations establish the central interpretive axis: the text is not a philosophical treatise but a living record of spiritual exercises practiced in the moment, revealing a man — not merely a system — who relentlessly examines, exhorts, and attempts to persuade himself toward virtue. The corpus registers a persistent tension between Marcus as institutional embodiment of Stoic rationalism (emperor, soldier, legislator) and Marcus as intimate confessant whose private notebooks disclose fragility, grief, and moral struggle. Hadot’s editions of the Meditations and his What Is Ancient Philosophy? trace the emperor’s philosophical formation — his teachers, the influence of Epictetus, and the peculiar genre of his private self-address — while also noting the troubling contradiction between his famed clemency and the persecution of Christians under his reign. The Meditations themselves insist on the indifference of externals, the sufficiency of virtue for happiness, and the contemplation of death as liberation. Across these readings, Marcus Aurelius emerges as the supreme ancient instance of philosophy as a way of life.