The shores, and the high places of the gods, fill with the clamor of applause. Cassiope and Cepheus rejoice, and greet their son-in-law, acknowledging him as the pillar of their house, and their deliverer. Released from her chains, the girl comes forward, the prize and the cause of his efforts. He washes his hands, after the victory, in seawater drawn for him, and, so that Medusa’s head, covered with its snakes, is not bruised by the harsh sand, he makes the ground soft with leaves, and spreads out plants from below the waves, and places the head of that daughter of Phorcys on them. The fresh plants, still living inside, and absorbent, respond to the influence of the Gorgon’s head, and harden at its touch, acquiring a new rigidity in branches and fronds. And the ocean nymphs try out this wonder on more plants, and are delighted that the same thing happens at its touch, and repeat it by scattering the seeds from the plants through the waves. Even now corals have the same nature, hardening at a touch of air, and what was alive, under the water, above water is turned to stone.
Bk IV:753-803 Perseus tells the story of Medusa
To the three gods, he builds the same number of altars out of turf, to you Mercury on the left, to you Minerva, warlike virgin, on the right, and an altar of Jupiter in the centre. He sacrifices a cow to Minerva, a calf to the wing-footed god, and a bull to you, greatest of the gods. Then he claims Andromeda, without a dowry, valuing her as the worthiest prize. Hymen and Amor wave the marriage torch, the fires are saturated with strong perfumes, garlands hang from the rafters, and everywhere flutes and pipes, and singing, sound out, the happy evidence of joyful hearts. The doors fold back to show the whole of the golden hall, and the noble Ethiopian princes enter to a richly prepared banquet already set out for them.
When they have attacked the feast, and their spirits are cheered by wine, the generous gift of Bacchus, Perseus asks about the country and its culture, its customs and the character of its people. At the same time as he instructed him about these, one of the guests said ‘Perseus, I beg you to tell us by what prowess and by what arts you carried off that head with snakes for hair.’ The descendant of Agenor told how there was a cave lying below the frozen slopes of Atlas, safely hidden in its solid mass. At the entrance to this place the sisters lived, the Graeae, daughters of Phorcys, similar in appearance, sharing only one eye between them. He removed it, cleverly, and stealthily, cunningly substituting his own hand while they were passing it from one to another. Far from there, by hidden tracks, and through rocks bristling with shaggy trees, he reached the place where the Gorgons lived. In the fields and along the paths, here and there, he saw the shapes of men and animals changed from their natures to hard stone by Medusa’s gaze. Nevertheless he had himself looked at the dread form of Medusa reflected in a circular shield of polished bronze that he carried on his left arm. And while a deep sleep held the snakes and herself, he struck her head from her neck. And the swift winged horse Pegasus and his brother the warrior Chrysaor, were born from their mother’s blood.
He told of his long journeys, of dangers that were not imaginary ones, what seas and lands he had seen below from his high flight, and what stars he had brushed against with beating wings. He still finished speaking before they wished. Next one of the many princes asked why Medusa, alone among her sisters, had snakes twining in her hair. The guest replied ‘Since what you ask is worth the telling, hear the answer to your question. She was once most beautiful, and the jealous aspiration of many suitors. Of all her beauties none was more admired than her hair: I came across a man who recalled having seen her. They say that Neptune, lord of the seas, violated her in the temple of Minerva. Jupiter’s daughter turned away, and hid her chaste eyes behind her aegis. So that it might not go unpunished, she changed the Gorgon’s hair to foul snakes. And now, to terrify her enemies, numbing them with fear, the goddess wears the snakes, that she created, as a breastplate.
Bk V:149-199 Perseus uses the Gorgon’s head

There is yet more to be done, despite what he has endured: the purpose of all is to overwhelm this one man. The bands of conspirators oppose him on all sides, in a cause opposed to justice, and good faith. His father, with helpless loyalty, and his new bride and her mother, support him to the best of their abilities, filling the palace with their cries. But the clash of weapons and the groans of the fallen, drown them out, and at the same time Bellona, goddess of war, pollutes and drenches the penates, the household gods, with blood, and stirs renewed conflict.

Phineus and a thousand followers of Phineus, surround the one man. Spears to the right of him, spears to the left of him, fly thicker than winter hail, past his eyes and ears. He sets his back and shoulders against a massive stone column, and protected behind, turns towards the opposing crowd of men, and withstands their threat. The Chaonian, Molpeus, presses him on the left, and on the right Ethemon, a Nabatean. Like a tiger, goaded by hunger, that hears the bellowing of two herds of cattle in separate valleys, and does not know which it would rather rush at, fired up to rush at either, so Perseus hesitates whether to strike right or left. He drives Molpeus off, piercing him with a wound to the leg, and is content to let him go: but Ethemon allows him no time, and raging and eager to give him a wound high on the neck, flails at him, incautiously and violently, and fractures his sword, striking it on the extreme edge of the column. The blade is detached, and fixes itself in its owner’s throat. The wound it gives him is not serious enough to cause his death, but as he stands there, quivering, and uselessly stretching out his defenceless arms, Perseus stabs him with CyllenianMercury’s curved sword.

When Perseus saw indeed that, his efforts would succumb to the weight of numbers, he said ‘Since you plan it like this, I will ask help of the enemy. If there are any friends here, turn your face away!’ and he held up the Gorgon’s head. ‘Find others, who might be worried by your marvel’ said Thesculus, but as he prepared to throw his deadly javelin, he was frozen, like a marble statue, in the act. Ampyx, next to him, thrust his sword straight at the heart of the courageous descendant of Lynceus, and, in thrusting, his right hand stiffened, without movement this way or that. But Nileus who falsely claimed that he was born of the Nile with its seven mouths, his shield engraved with its seven streams, part gold, part silver, cried ‘Perseus, see, the sources of my people: it will be a great consolation to you to take with you, in death, to the silent shadows, the knowledge of having fallen to so noble a man’. The last echo of his voice was cut off in mid-flight, and you might believe his mouth still wished to speak, though it was no longer pervious to words.

Eryx rebuked them, saying, ‘Lack of courage, not the power of the Gorgon, freezes you. Rush in with me and knock this youth and his magic weapon to the ground!’ He had started his rush, but the floor held his feet fast, and there he stayed, unmoving stone, a fully-armed statue.

Bk V:200-249 Phineus is turned to stone

They all deserved the punishment they suffered, except one of Perseus’s warriors. While he was fighting on his side, Aconteus, saw the Gorgon’s head, and took the shape of hardened stone. Astyages struck him with his long sword thinking he was still alive, and the blade gave a high-pitched ringing noise. While Astyages stood there amazed, the same power transformed him, and he remained there with a wondering look on his marble face. It would take a long time to tell the names of the middle ranks of men: two hundred bodies survived the fight, two hundred bodies were turned to stone, at sight of the Gorgon’s head.

Now, at last, Phineus regrets the unjust fight, but what can he do? He sees the figures in diverse attitudes, and recognises the men, and calling on each by name, asks his help. Disbelieving, he touches the bodies nearest to him. They are marble. He averts his gaze from Perseus, and in supplication, he stretches out his hands in acknowledgement, his arms still held out towards him. ‘Perseus’, he cries, ‘you have won! Take away that monstrous thing of yours: remove your head of the Medusa, whoever she may be, that turns men to stone. Take it away, I beg you! It was not hate, or desire for power, that drove me to war. I took up arms to win a bride! Your claim was greater by merit, but mine by precedence. I do not regret ending it. Give me nothing, except my life, most resolute of men, the rest is yours!’ So speaking, not daring to look towards him to whom he directed his request, Perseus replied ‘Have no fear, most cowardly Phineus, I will grant both what I can grant, and what is a great gift to the fearful! You will not suffer the sword. Rather I will cause you to be an enduring monument through the ages, and you will always be seen in my father-in-law’s palace, so that my wife may find solace in the statue of her intended.’ He spoke, and carried the head of Phorcys’s daughter to where Phineus had turned his frightened face. As Phineus tried to avert his gaze, his neck hardened, and the tears on his cheeks were turned to stone. Now the frightened face, the suppliant expression, the submissive hands, and the slavish appearance, remained, in marble.

The victorious descendant of Abas, with his bride, enters Argos, his ancestral city, and as the champion and vindicator of his grandfather Acrisius, who little deserves it, he attacks Proetus, who has made his brother a fugitive by force of arms, and seized his stronghold. But neither by force of arms, nor by possession of the stronghold he had taken in his wickedness, could he overcome the fierce gaze of the snake-wreathed monster.

Still, you, O Polydectes, king of tiny Seriphos, softened neither by the young man’s virtue, visible in all his efforts, nor by his suffering, nursed a harsh and unrelenting hatred, and there was no limit to your baseless anger. You disparaged the praise given him, and accused his account of the killing of Medusa of being a lie. ‘I will give you evidence of its truth. Friends, protect your eyes!’ cried Perseus, and with the face of Medusa he turned the face of the king to bloodless stone.