Hierosgamos — the sacred marriage — occupies a structural position at the very centre of depth psychology’s engagement with alchemy, mythology, and the phenomenology of psychic wholeness. Jung identified the term with the coniunctio oppositorum, treating it not as a literal sexual rite but as the archetypal image of the union of psychic opposites: Sol and Luna, conscious and unconscious, Logos and Eros, sponsus and sponsa. In his alchemical writings, most elaborately in Mysterium Coniunctionis and the commentary on Rosarium Philosophorum, he traces the hierosgamos from ancient cultic practice through Gnostic, Kabbalistic, and Hermetic currents, arguing that alchemists allegorized the conjunctio as a ritual cohabitation that projected the inner drama of psychological integration onto matter. Von Franz extends this reading through the Aurora Consurgens, where the divine pair’s union signals the breakthrough of the generative unconscious into consciousness and carries unmistakable intimations of immortality. Nichols emphasizes its inherently inner character — its incestuous symbolism marking it as an intrasubjective event rather than an external alliance. Jung himself drew the complementary concept against Neumann’s notion of incest, insisting that the pair incest/hierosgamos must be held together to do justice to the full situation. Personal testimony surfaces in Memories, Dreams, Reflections, where Jung describes his own visionary experience of the mystic marriage in Kabbalistic imagery as paradigmatically real. The term thus traverses clinical, mythological, and confessional registers throughout the corpus.