(Greek) "Primeval god" or the “first-born”; used of all the manifested gods and of the Sun.
"The Divine Ray and the Chaos, Pistis Sophia and the Great Abyss, shine with pleasure when united. Thus, the Chaos delectably sparkles when obtaining its meaning from this union with the Spirit. When Sophia, as Divine Spirit, is associated with the Chaos, then the Protogonos, the primogenial light, emerges. The Logoic Ray, impregnated by Sophia, fecundates the waters of life, in order for the Universe to emerge." - Samael Aun Weor, The Gnostic Bible: The Pistis Sophia Unveiled
“Declare to me from the beginning, you Mousai who dwell in the house of Olympos, and tell me which of them first came to be. In truth at first Khaos (Air) came to be, but next wide-bosomed Gaia (Earth), the ever-sure foundation of all the deathless ones who hold the peaks of snowy Olympos, and dim Tartaros (Hell) in the depth of the wide-pathed Earth, and Eros [or Himeros] (Love), fairest among the deathless gods, who unnerves the limbs and overcomes the mind and wise counsels of all gods and all men within them. From Khaos (Air) came forth Erebos (Darkness) and black Nyx (Night); but of Nyx (Night) were born Aither (Light) and Hemmera (Day), whom she conceived and bore from union in love with Erebos. And Gaia (Earth) first bore starry Ouranos (Heaven), equal to herself, to cover her on every side, and to be an ever-sure abiding-place for the blessed gods. And she brought forth long Ourea (Mountains), graceful haunts of the goddess Nymphai who dwell amongst the glens of the hills. She bore also the fruitless deep with his raging swell, Pontos (Sea), without sweet union of love. But afterwards he [Gaia] lay with Ouranos and bare deep-swirling Okeanos, Koios and Krios and Hyperion and Iapetos, Theia and Rhea, Themis and Mnemosyne and gold-crowned Phoibe and lovely Tethys. After them was born Kronos the wily, youngest and most terrible of her children, and he hated his lusty sire. And again, she bare [Gaia to Ouranos] the Kyklopes, overbearing in spirit, Brontes, and Steropes and stubborn-hearted Arges, who gave Zeus the thunder and made the thunderbolt: in all else they were like the gods, but one eye only was set in the midst of their fore-heads. And they were surnamed Kyklopes (Orb-eyed) because one orbed eye was set in their foreheads. Strength and might and craft were in their works. And again, three other sons were born of Gaia and Ouranos, great and doughty beyond telling, Kottos and Briareos and Gyes, presumptuous children. From their shoulders sprang a hundred arms, not to be approached, and each had fifty heads upon his shoulders on their strong limbs, and irresistible was the stubborn strength that was in their great forms. For of all the children that were born of Gaia and Ouranos, these were the most terrible, and they were hated by their own father from the first. And he used to hide them all away in a secret place of Gaia (Earth) so soon as each was born, and would not suffer them to come up into the light: and Ouranos rejoiced in his evil doing. But vast Gaia (Earth) groaned within, being straitened, and she made the element of grey flint and shaped a great sickle, and told her plan to her dear sons [the Titans]. And she spoke, cheering them, while she was vexed in her dear heart: `My children, gotten of a sinful father, if you will obey me, we should punish the vile outrage of your father; for he first thought of doing shameful things.’ So she said; but fear seized them all, and none of them uttered a word. But great Kronos the wily took courage and answered his dear mother: `Mother, I will undertake to do this deed, for I reverence not our father of evil name, for he first thought of doing shameful things.’ So he said: and vast Gaia rejoiced greatly in spirit, and set and hid him in an ambush, and put in his hands a jagged sickle, and revealed to him the whole plot. And Ouranos came, bringing on night and longing for love, and he lay about Gaia spreading himself full upon her. Then the son from his ambush stretched forth his left hand and in his right took the great long sickle with jagged teeth, and swiftly lopped off his own father’s members and cast them away to fall behind him.” - Hesiod, Theogony 115