It was Princess Rhaena, legend says, who put a dragon’s egg in Princess Alysanne’s cradle, just as she had for Prince Jaehaerys two years earlier. If those tales be true, from those eggs came the dragons Silverwing and Vermithor, whose names would be writ so large in the annals of the years to come.

- Fire and Blood "The Sons of the Dragon"

Like his father, Aenys Targaryen, the First of His Name, was given over to the flames in the yard at Dragonstone. His funeral was attended by his sons Viserys and Jaehaerys, twelve and seven years of age respectively, and his daughter Alysanne, five. His widow, Queen Alyssa, sang a dirge for him, and his own beloved Quicksilver set his pyre alight, though it was recorded that the dragons Vermithor and Silverwing added their own fire to hers.

- Fire and Blood "The Sons of the Dragon"

When at last Maegor returned to King’s Landing to seat himself again upon the Iron Throne, he was greeted with the news that his mother, Queen Visenya, had died. Moreover, in the confusion that followed the death of the Queen Dowager, Queen Alyssa and her children had made their escape from Dragonstone, with the dragons Vermithor and Silverwing…to where, no man could say. They had even gone so far as to steal Dark Sister as they fled.

- Fire and Blood The Sons of the Dragon"

Prince Jaehaerys was fourteen years old when he claimed the throne; a handsome youth, skilled with lance and longbow, and a gifted rider. More, he rode a great bronze-and-tan beast called Vermithor, and his sister Alysanne, a maid of twelve, commanded her own dragon, Silverwing. “Maegor has only one dragon,” Lord Rogar told the stormlords. “Our prince has two.”

- Fire and Blood "The Sons of the Dragon"

King Jaehaerys and Princess Alysanne were the last to appear, descending from a bright sky on their dragons, Vermithor and Silverwing (the Dragonpit still lacked the great dome that would be its crowning glory, it must be recalled), their great leathern wings stirring up clouds of sand as they came down side by side, to the awe and terror of the gathered multitudes. (The oft-told tale that the arrival of the dragons caused the aged High Septon to soil his robes is likely only a calumny.)

- Fire and Blood "The Year of the Three Brides-49 AC"

That night, under cover of darkness, King Jaehaerys and Princess Alysanne mounted their dragons, Vermithor and Silverwing, and departed the Red Keep for the ancient Targaryen citadel below the Dragonmont. Reportedly the first words the young king spoke upon landing were, “I have need of a septon.

- Fire and Blood "The Year of the Three Brides-49 AC"

During the course of his long reign, Jaehaerys would spend more days and nights guesting with one lord or another, or holding audience in some market town or village, than at Dragonstone and the Red Keep combined. And oft as not, Alysanne was with him, her silvery dragon soaring beside his great beast of burnished bronze.

- Fire and Blood "Birth, Death, and Betrayal Under King Jaehaerys I"

Princess Aerea had known Vermithor and Silverwing during her time at court, but she had never been allowed too close to them. Here she could visit with the dragons as often as she liked; the hatchlings, the young drakes, her mother’s Dreamfyre…and greatest of them all, Balerion and Vhagar, huge and ancient and sleepy, but still terrifying when they woke and stirred and spread their wings.

- Fire and Blood "Birth, Death, and Betrayal Under King Jaehaerys I"

The unexpected arrival of Vermithor and Silverwing at Oldtown brought thousands to the streets to point and stare. No word of their coming had been sent ahead, and there were many in the city who were frightened, wondering what this might portend…none, mayhaps, more than Septon Mattheus, who turned pale when he was told. Jaehaerys brought down Vermithor on the wide marble plaza outside the Starry Sept, but it was his queen who made the city gasp when Silverwing alighted atop the Hightower itself, the beating of her wings fanning the flames of its famous beacon.

- Fire and Blood "Birth, Death, and Betrayal Under King Jaehaerys I"

When Alysanne tried to share stories of her own girlhood, and told of how Rhaena had put a dragon’s egg into her cradle and cuddled and cared for her “as if she were my mother,” Aerea said, “She never gave me an egg, she just gave me away and flew off to Fair Isle.”

- Fire and Blood "Birth, Death, and Betrayal Under King Jaehaerys I"

All such preparations were thrown into disarray by the sudden and unexpected arrival of Rhaena Targaryen from Dragonstone. “It may well be that dragons somehow sense, and echo, the moods of their riders,” Septon Barth wrote, “for Dreamfyre came down out of the clouds like a raging storm that day, and Vermithor and Silverwing rose up and roared at her coming, suchwise that all of us who saw and heard were fearful that the dragons were about to fly at one another with flame and claw, and tear each other apart as Balerion once did to Quicksilver by the Gods Eye.”

- Fire and Blood "Birth, Death, and Betrayal Under King Jaehaerys I"

Three younger dragons soon joined the Black Dread under the Hill of Rhaenys, whilst Vermithor and Silverwing remained at the Red Keep, close to their riders.

- Fire and Blood "Jaehaerys and Alysanne: Their Triumphs and Tragedies"

Queen Alysanne’s travels began in the city of White Harbor, where tens of thousands of northerners turned out to cheer her and gape at Silverwing with awe, and a bit of terror. It was the first time any of them had seen a dragon. The size of the crowds surprised even their lord.

- Fire and Blood "Jaehaerys and Alysanne: Their Triumphs and Tragedies"

After taking leave of White Harbor, the queen’s retinue sailed up the White Knife to its rapids, then proceeded overland to Winterfell, whilst Alysanne herself flew ahead on Silverwing. The warmth of her reception at White Harbor was not to be duplicated at the ancient seat of the Kings in the North, where Alaric Stark and his sons alone emerged to greet her when her dragon landed before his castle gates.

- Fire and Blood "Jaehaerys and Alysanne: Their Triumphs and Tragedies"

Once the initial frost had thawed, his lordship took the queen hunting after elk and wild boar in the wolfswood, showed her the bones of a giant, and allowed her to rummage as she pleased through his modest castle library. He even deigned to approach Silverwing, though warily.

- Fire and Blood "Jaehaerys and Alysanne: Their Triumphs and Tragedies"

Though it was summer and the Wall was weeping, the chill of the ice could still be felt whenever the wind blew, and every gust would make the dragon hiss and snap. “Thrice I flew Silverwing high above Castle Black, and thrice I tried to take her north beyond the Wall,” Alysanne wrote to Jaehaerys, “but every time she veered back south again and refused to go. Never before has she refused to take me where I wished to go. I laughed about it when I came down again, so the black brothers would not realize anything was amiss, but it troubled me then and it troubles me still.”

- Fire and Blood "Jaehaerys and Alysanne: Their Triumphs and Tragedies"

Her mother had been fearless; Daella always seemed to be afraid. She had a kitten that she loved until he scratched her; then she would not go near a cat. The dragons terrified her, even Silverwing.

- Fire and Blood "The Long Reign - Jaehaerys and Alysanne: Policy, Progeny, and Pain"

Queen Alysanne was frightened too, once she read those words. She mounted Silverwing within days and flew swiftly to the Vale, alighting first in Gulltown before proceeding on to the Gates of the Moon, and then skyward to the Eyrie.

- Fire and Blood "The Long Reign - Jaehaerys and Alysanne: Policy, Progeny, and Pain"

And oh, how she had loved to fly. Silverwing had carried her to Oldtown, to the Wall, and to a thousand places in between, and Alysanne saw them all as few others ever would, looking down from above the clouds.

- Fire and Blood "The Long Reign - Jaehaerys and Alysanne: Policy, Progeny, and Pain"

She was far too unsteady to fly. Silverwing last carried her into the sky in 93 AC. When she came to earth again and climbed painfully from her dragon’s back, the queen wept.

- Fire and Blood "The Long Reign - Jaehaerys and Alysanne: Policy, Progeny, and Pain"

“A cock is not essential. If Your Grace truly believes that women lack the wit to rule, plainly you have no further need of me.” And thus Queen Alysanne departed King’s Landing and flew to Dragonstone on her dragon Silverwing. She and King Jaehaerys remained apart for two years, the period of estrangement recorded in the histories as the Second Quarrel.

- Fire and Blood "Heirs of the Dragon: A Question of Succession"

Moreover, six other dragons made their lairs in the smoky caverns of the Dragonmont above the castle. There was Silverwing, Good Queen Alysanne’s mount of old; Seasmoke, the pale grey beast that had been the pride and passion of Ser Laenor Velaryon; hoary old Vermithor, unridden since the death of King Jaehaerys.

- Fire and Blood "The Dying of the Dragons: The Blacks and the Greens"

The most unlikely of these would-be dragonriders was Mushroom himself, whose Testimony speaks at length of his attempt to mount old Silverwing, judged to be the most docile of the masterless dragons. 

- Fire and Blood "The Dying of the Dragons: The Red Dragon and the Gold"