Subject-will-mind in the Godhead?

[RamistThomist]

I know according to Classical Theology, expressed clearly in Gregory of Nyssa's "On Not Three Gods," posits one mind, will, and energy of motion in the godhead

(for further reference, cf Hodge, volume 1, pp. 462-463)

The third point decided concerning the relation of the persons of the Trinity, one to the other, relates to their union. As the essence of the Godhead is common to the several persons, they have a common intelligence, will, and power. There are not in God three intelligences, three wills, three efficiencies. The Three are one God, and therefore have one mind and will.

I know all of that. My question relates to any of the major theologians speak of one subject in the Godhead? I know subject became prominent in the West after Kant and Hegel. Was it used to reference the one mind-will-consciousness common to the Divine Essence prior to the European Enlightenment?