The Green Lion occupies a pivotal position in the depth-psychological engagement with alchemy, functioning simultaneously as prima materia, arcane solvent, and psychic symbol of raw, untransformed instinctual energy. Within the corpus, the term draws its weight primarily from Jung’s sustained exegesis in Mysterium Coniunctionis and Alchemical Studies, where it is identified as the ore from which philosophical mercury is extracted — terra, the unclean body, the desert place, the foundation of all nature. Jung reads it as a manifestation of Mercurius duplex, oscillating between green and red, and as the passionate emotionality that precedes conscious integration of unconscious contents. Edinger extends this reading clinically, glossing the act of drinking the Green Lion’s blood as the assimilation of bestial affect — a charged moment in the analytic encounter. Hillman brings a distinctly post-Jungian inflection: in his alchemical psychology the Green Lion emblematizes sulfuric vitality fused with Venus, the ardent green of the heart’s desire that must be sublimed rather than suppressed. Abraham’s lexicographic work anchors the symbol in textual tradition, tracing its synonyms — assafoetida, white smoke, stinking water — across Ripley, Dunstan, Maier, and Khunrath. A key tension in the corpus concerns the Green Lion’s ambivalence: it is both the corrupting dissolvent that devours the sun and the ‘means of conjoining the tinctures,’ holding destruction and mediation in the same image.