Conciliar Trinitarianism, Divine Identity Claims, and Subordination

In this article, I present the trinitarian teaching of the first seven ecumenical councils, what we might call Conciliar Trinitarianism. I then consider two questions. First, what is the relationship between the divine persons and the divine nature? I argue that neither strict identity nor instantiation interpretations of that relationship fit well with the conciliar texts. Second, does the relation of procession among the divine persons, asserted in the conciliar texts, imply an objectionable ontological subordination in the Trinity? I argue that there is at least one way for a proponent of Conciliar Trinitarianism to deny that objectionable ontological subordination follows from the divine processions.