In the earliest stages of that evolution we have (Iren. I. i.) eight primary Aeons constituting the first Ogdoad. The ultimate conception of God, named the Ineffable Father and who has existed since before the beginning, is described as Depth or Profundity (Bythos).
All around him exists a female power that has been named Silence (Sige). These two deities, Depth and Silence, become the cause, through a process of emanation, of the other archetypal beings or Aeons.
The Aeons are always born in male-female pairs (as syzygies), each of which is in itself a divine principle but at the same time represents one aspect of the Ineffable Father, who otherwise could not be described nor comprehended as he is beyond all names.
The emanation takes place in the following manner: Depth-and-Silence gives birth to Mind-and-Truth (Nous and Aletheia), who gives birth to Word-and-Life (Logos and Zoe), who gives birth to Man-and-Church (Anthropos and Ecclesia).
These Aeonic pairs comprise the Fullness of Godhead (Pleroma), and the first eight Aeons that have been expounded here are the Valentinian Ogdoad.Ogdoad (Gnosticism) – Wikipedia