Archdemon is one of the Old Gods manifested in a form of powerful dragon, tainted by darkspawn. It is far more intelligent than an average dragon and it is purely evil creature. Under the surface darkspawn search for the sleeping Old Gods and when they find on of ancient dragons, it is immediately afficted by the taint.
Smaug was considered to be the last fire dragon to exist in Middle-earth in the Third Age. He came from the mountains in the north fascinated by the riches of dwarves which included gold, gemstones and famed Arkenstone.
Villentretenmerth, in common speech Three Black Birds was one of the two known golden dragons in the whole Continent. He enjoyed living among people and thanks to his skills of polymorphism he could travel through lands incognito.
The Wawel Dragon is legendary dragon known in Polish folklore who lived in a cave under the Wawel Hill in Kraków on the bank of the Vistula River. The oldest story was created in XIII century by Wincenty Kadłubek, a polish historian and Bishop of Kraków.
Paarthurnax is a powerful dragon which appears in a game The Elder Scrolls V: Skyrim as the leader of the Greybeards, an ancient and honored order. He’s an ancient and immortal dragon and there are a lot of signs of won battles on his body like tattered skin or broken horns.