> [Nakagawa, Yoichiro](nakagawa.md). "The Trinity and the Three-Tiered Structure in the Proto-Indo-European Organizations: Consequences of Assigning Dogs the Role of Mediators." Keizaigaku Ronsan (The Journal of Economics), 61(3-4) 65-94, Jan 30, 2021. > [researchmap.jp](https://researchmap.jp/read0026230/published_papers/32050497)  ## Contents Introduction - The Trinity as the Theological Core of Christianity [I] Sheep Herding and its Implications 1 Shepherd-Flock Relationship as a Primordial Political System 2 The Third Animals as Auxiliaries to Assist Shepherds 3 Two Types of Mediators in the Nomadic Three-Tiered Structure: Passive and Active [Ⅱ] Dogs in the Proto-Indo-European Culture and Society 1 The Connotation of Dogs in the Indo-European Culture 2 Fraternity 3 The Formation of the Military Aristocracy that is Unique to Indo-Europeans 4 A Three-Tiered Structure Generated by Dog-Mediators in the Nomadic Herding  Organization [Ⅲ] The Mediator in European Christianity 1 The Many Mediators in Monotheism and Jesus as a Jew in the Bible 2 Jesus Christ, the True Mediator: Half-man and Half-God Conclusion - Half-man, Half-God: The Foundation of European Identity