Henry Corbin (1903–1978), French Islamicist and philosopher of Iranian Sufism, occupies a singular position in the depth-psychology corpus as the thinker who furnished archetypal psychology with its most consequential conceptual gift: the mundus imaginalis. Where Jung supplied the ancestral framework, Corbin supplied the ontological warrant for treating imagination as a real, intermediate realm—neither merely subjective fantasy nor brute empirical fact, but a third order of being that Hillman repeatedly designated the proper ground of psyche. The library reveals Corbin operating simultaneously as scholar, mystic, and theoretical ally: he lectured at Eranos for twenty-seven consecutive years; he contributed the prefatory letter to David Miller’s The New Polytheism; he called Hillman’s Re-Visioning Psychology ‘the psychology of the resurgence of the Gods.’ Hillman reciprocated by naming Corbin ‘the second immediate father of archetypal psychology’ after Jung. Yet the relationship was not without productive tension: Hillman diverged from Corbin over pathology in the imaginal, arguing that the monstrous and the horrible belong to imagination’s legitimate range, while Corbin held such imagery to betray secularization. Across the corpus Corbin figures as theologian, angelologist, philosopher of the heart, and Sufi interpreter—each facet refracting differently through the psychological lenses of Hillman, Miller, Romanyshyn, and Bosnak.