what does begot mean what is a flat character

GAIA (no father) (Hesiod Theogony 126, Nonnus Dionysiaca 27.50) In the Roman era he was often depicted as Aion, god of eternal time, in the form of a man holding the zodiac-wheel, standing above the reclining Gaia (Earth). Ouranos does not appear in early Greek art but Egyptian depictions of their sky-goddess Nut demonstrate how he was imagined-as a gigantic, star-spangled man with long arms and legs, resting on all fours, with his finger-tips in the far east, his toes in the far west, and his arching body raised to form the dome of the sky. Ouranos prophesied the fall of the Titanes and the punishments they would suffer for their crimes-a prophecy brought to fruition by Zeus who deposed the five brothers and cast them into the pit of Tartaros. The sky-god's blood fell upon the earth, producing the avenging Erinyes and the Gigantes (Giants). Four of these positioned themselves at the corners of the world, ready to grasp their father as he descended to lie with Earth, while the fifth, Kronos (Cronus), took his place in the centre and there castrated Ouranos with an adamantine sickle. Gaia suffered immense pain and persuaded her Titan sons to rebel. He locked the eldest of these-the giant Kyklopes (Cyclopes) and Hekatonkheires (Hecatoncheires)-away inside the belly of Earth. Ouranos and Gaia had twelve sons and six daughters. Ouranos was the literal sky, just as his consort Gaia (Gaea) was the earth. The Greeks imagined the sky as a solid dome of brass, decorated with stars, whose edges descended to rest upon the outermost limits of the flat earth. OURANOS (Uranus) was the primordial god ( protogenos) of the sky.

Sky, Heaven Aeon-Uranus and the Zodiac-Wheel, Greco-Roman mosaic C3rd A.D., Glyptothek Munich

What does begot mean what is a flat character