Below are two interesting articles that relate some familiar Binitarian categories and terminology to the Holy Spirit. Naturally, there is much fodder here for triangulating (pardon the pun) to a tri-nitarian godhead, perhaps even in the Hebrew Bible. The author of both articles is Bogdan G. Bucur:
The Son of God and the Angelomorphic Holy Spirit: A Rereading of the Shepherd’s Christology (the article deals with the Shepherd of Hermas, a writing included in that body of ancient Christian literature known as the Apostolic Fathers)
The Angelic Spirit in Early Christianity: Justin, the Martyr and Philosopher
