Byzantine ecclesiastical politics enters the depth-psychology corpus almost exclusively through Dvornik’s exhaustive 1948 study of the Photian Schism, which supplies the historical substrate upon which broader questions of institutional power, projection, and collective psychology depend. Dvornik’s governing insight — that Byzantine church life was structured by two entrenched, rival parties whose ‘party spirit runs through the whole skein of Byzantine history like a thread’ — reframes doctrinal dispute as the surface expression of deeper psychosocial antagonisms. The resulting picture is one of an institutional field in which canonical law, personal ambition, imperial patronage, and theological conviction are so thoroughly entangled as to be analytically inseparable. Campbell’s parallel treatment, drawing on the Council of Chalcedon’s jurisdictional decrees, shows how ecclesiastical politics encoded geopolitical rivalry — the authority of Constantinople mirroring, and competing with, the imperial prestige of Old Rome. Hillman offers the only explicitly depth-psychological inflection, naming ‘Byzantine paralysis’ as a symptomatic expression of the state’s inherent paranoia. Taken together, these voices establish Byzantine ecclesiastical politics not as antiquarian footnote but as an archetypal demonstration of how collective shadow, institutional narcissism, and the will to power operate within ostensibly sacred structures.