A List of dragons mentioned in the series, who they were ridden by, and a brief hitory of their life. (above)
Vermax. Ridden by Prince Jacaerys Velaryon. Born after the War of Conquest. Died in 130 AC.Vermithor, also called the Bronze Fury. Ridden by King Jaehaerys I Targaryen and later by Hugh Hammer. Born after the War of Conquest. Died in 130 AC, during the Dance of the Dragons, atTumbleton.
Vhagar. Ridden by Queen Visenya Targaryen until her death in 44 AC. Later ridden by Lady Laena Velaryon, and shortly after her death claimed by Prince Aemond Targaryen. Vhagar was born in51 BC and died in 130 AC, during the Dance of the Dragons.
The last living dragon. Born and died during the reign of King Aegon III Targaryen. Was once seen by Ser Arlan of Pennytree when he was still a boy; it was not really combat-worthy.[28
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-We now know that Dragons were located everywhere in Planetos, as the maesters have said that their bones can be found from Westeros to Yi Ti.
-The maesters do not at all discount there being "ice dragons", as they also state that many supernatural things that occur in The Shivering Sea that can be attributed to Ice Dragon encounters.
-There were those who lived in Valyria that also explored the world on dragon back. One such explorer traveled deep into Southern Sothoryos, yet only found thicker and thicker jungle.
-There are different kinds of dragonkin, in different areas of planetos. Many are the types of wyrms, nightscales, etc.
-There was an account by Murshoom that the dragon that was ridden to Winterfell during The Dance of Dragons, also laid a clutch deep within the crypts. This is of course discounted by the maesters, who want to refute anything to do with dragons.