The Early Ante-Nicene Church Father Lactantius Wrote:

Lactantius (c. 250 -c. 325), a Latin Christian Father of the third century, taught the following:

“Before creating the world, God produced a spirit like himself, replete with virtues of the Father. Later He made another, in whom the mark of divine was erased, because this one was besmirched by the poison of jealousy and turned therefore from good to evil. He was jealous of his older brother who, remaining united with the Father, insured his affection unto himself.” (Giovanni Papini, The Devil (New York: E.P. Dutton, 1984), 81–82)

He also taught:

"Since God was possessed of the greatest foresight for planning, and of the greatest skill for carrying out in action, before He commenced this business of the world,--inasmuch as there was in Him, and always is, the fountain of full and most complete goodness,--in order that goodness might spring as a stream from Him, and might flow forth afar, He produced a Spirit like to Himself, who might be endowed with the perfections of God the Father... Then He made another being, in whom the disposition of the divine origin did not remain. Therefore he was infected with his own envy as with poison, and passed from good to evil; and at his own will, which had been given to him by God unfettered, he acquired for himself a contrary name. From which it appears that the source of all evils is envy. For he envied his predecessor, who through his steadfastness is acceptable and dear to God the Father. This being, who from good became evil by his own act, is called by the Greeks diabolus: we call him accuser, because he reports to God the faults to which he himself entices us. God, therefore, when He began the fabric of the world, set over the whole work that first and greatest Son, and used Him at the same time as a counselor and artificer, in planning, arranging, and accomplishing, since He is complete both in knowledge, and judgment, and power..." (Lactantius, Divine Institutes 2.9. in Alexander Roberts and James Donaldson, eds. The Ante-Nicene Fathers, 10 vols. (1885; reprint, Peabody: Hendrickson, 2004), 7:52–53.)

Many things he here taught are not considered "orthodox" by today's standards. However, Lactantius was definitely orthodox during his lifetime. Amazingly, many things here correspond to LDS doctrine precisely in those areas that are "unorthodox." For example,

1. "He produced a Spirit like to Himself," namely Christ. Christ, in this sense, is not the "co-equal," "eternally begotten," "same substance" "persona" of the later creeds.
2. "Then he made another being, in whom the disposition of the divine origin did not remain." God made another spirit who rebelled and who fell from his exalted status. He is the diabolus.
3. Christ is the "first and greatest Son." Not the "only" son.
4. Lastly, since the diabolus and Christ are both spirit sons of God, they are spirit brothers.