Who is the last dragon in Game of Thrones?

Who is the last dragon in Game of Thrones? Daenerys Targaryen becomes the last dragonrider during Game of Thrones, but this title was previously held by a House of the Dragon character.

Daenerys Targaryen becomes the last dragonrider during Game of Thrones, but this title was previously held by a House of the Dragon character.
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