Tertullian — on Rev 2:6 (Pseudo-Tertullian Against All Heresies)

“A brother heretic emerged in Nicolaus. He was one of the seven deacons who were appointed in the Acts of the Apostles. He affirms that Darkness was seized with a concupiscence—and, indeed, a foul and obscene one—after Light: out of this permixture it is a shame to say what fetid and unclean (combinations arose). The rest (of his tenets), too, are obscene. For he tells of certain Æons, sons of turpitude, and of conjunctions of execrable and obscene embraces and permixtures, and certain yet baser outcomes of these. He teaches that there were born, moreover, dæmons, and gods, and spirits seven, and other things sufficiently sacrilegious alike and foul, which we blush to recount, and at once pass them by. Enough it is for us that this heresy of the Nicolaitans has been condemned by the Apocalypse of the Lord with the weightiest authority attaching to a sentence, in saying "Because this thou holdest, thou hatest the doctrine of the Nicolaitans, which I too hate."”