As I understand it a lot of them wrote in Greek and preached in Latin. Theophilus appears to have been one of the ones I was trying to remember. The quote below is a good indication of how the Godhead was understood in 169 AD. This pattern is pretty close to the one I adopted as my own years ago.
"For the divine writing itself teaches us that Adam said that he had heard the voice. But what else is this voice but the Word of God, who is also His Son? Not as the poets and writers of myths talk of the sons of gods begotten from intercourse [with women], but as truth expounds, the Word, that always exists, residing within the heart of God. For before anything came into being He had Him as a counsellor, being His own mind and thought. But when God wished to make all that He determined on, He begot this Word, uttered, the first-born of all creation, not Himself being emptied of the Word [Reason], but having begotten Reason, and always conversing with His Reason. And hence the holy writings teach us, and all the spirit-bearing [inspired] men, one of whom, John, says, "In the beginning was the Word, and the Word was with God," showing that at first God was alone, and the Word in Him. Then he says, "The Word was God; all things came into existence through Him; and apart from Him not one thing came into existence." The Word, then, being God, and being naturally produced from God, whenever the Father of the universe wills, He sends Him to any place; and He, coming, is both heard and seen, being sent by Him, and is found in a place."