Shrykos

"When Targaryen fought Targaryen in the civil war called the Dance of the Dragons, an angry mob stormed the Dragonpit, that huge now-ruined vault where Targaryens stabled their beasts. Thousands died, but through sheer numbers and madness, five of the Targaryen dragons lay dead by the morning."

- Pycelle

Shrykos was a dragon bred by House Targaryen.

Biography
During the Dance of the Dragons, an angry mob of smallfolk stormed the Dragonpit where House Targaryen stabled their dragons. Shrykos was among the five dragons killed, being slain by Hobb the Hewer.

In the books
In the A Song of Ice and Fire, Shrykos was a young she-dragon bound to Prince Jaehaerys Targaryen, son of King Aegon II Targaryen during the Dance of the Dragons. She was never ridden.

Shrykos died in the Dragonpit when it was invaded by a half-crazed angry mob after a one-handed prophet called the Shepherd began to rant against all dragons everywhere. There is little doubt that Shrykos killed scores of people in the Dragonpit before being slain. Shackled by her heavy chains, Shrykos was slain by a woodsman known as Hobb the Hewer who leapt onto her neck driving his axe into her skull as she roared and twisted, trying to throw him off. With his legs locked around the dragon's neck, Hobb delivered seven blows and each time his axe came down he roared out the name of each of the the Seven. It was the Stranger's blow that slew the dragon, his axe crashed through scale and bones into Shrykos's brain.