Martin’s official companion book The World of Ice & Fire: The Untold History of Westeros and the Game of Thrones, the yellowish Syrax is the “huge and formidable” female steed of Princess Rhaenyra (portrayed in House of the Dragon by Milly Alcock as a youth and Emma D’Arcy as an adult). He was first ridden by Lady Laena Velaryon and then later by Aemond Targaryen. Vhagar was named in honor of a god of Old Valyria, and will factor into later developments in House of the Dragon. Together, they burned the Arryn fleet in the waters off Gulltown. The second largest dragon of the Targaryens, Vhagar is an ancient female dragon and the last of those flown during Aegon’s conquest, when she served as the steed of Queen Visenya Targaryen.

The black and red mal dragon has died by the time House of the Dragon begins, but his massive skull can be seen on display at the Red Keep. The largest and eldest of all the Targaryen dragons, Balerion was flown by Aegon the Conqueror and later became the steed of King Viserys I. Let’s begin with the most notorious Targaryen dragon of them all … Balerion the Black Dread