Puerarchy — the structural dominance of boy-psychology over mature masculine energy in individuals and, by extension, in culture — emerges in the depth-psychology corpus primarily through Robert Moore and Douglas Gillette’s foundational typology in King Warrior Magician Lover (1990), where it names the condition of men who remain arrested in pre-initiatory masculine patterns: the Divine Child, the Oedipal Child, the Hero, and their shadow derivatives. Moore and Gillette diagnose puerarchy as the psychosocial consequence of the collapse of initiatory ritual, the absent or weak father, and the eclipse of archetypes of mature masculinity. Robert Bly, to whom Moore and Gillette dedicate their volume, corroborates the diagnosis through mythopoeic narrative, reading the disappearance of the Sacred King as the cultural substrate that leaves men marooned in boyhood. James Hillman’s extensive phenomenology of the puer aeternus supplies the archetypal grammar that underlies both accounts, distinguishing the positive spiritual verticality of the puer from its pathological fixation when untempered by senex gravitas. Marie-Louise von Franz adds clinical precision, tracing the mother-tie that sustains boy-psychology past its developmental season. What unites these voices is a shared conviction that puerarchy is not mere immaturity but an archetypal inflation — a psychic sovereignty held illegitimately by a structure meant to be transcended through genuine initiation into Man psychology.