Balinor

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It is believed that he is the last of the Dragonlords. And possibly Merlin's Father as he is the key to Merlin's own past.

It is unknown as of yet what where he came from; where he been all this time etc. However it is known that King Uther and he are enemies and that Uther hunted him and the rest of the Dragonlords during The Great Purge.

And it is hinted that he is the last hope to save Camelot from The Great Dragon as only a Dragonlord can kill a Dragon. It is rumored that this is the reason why he wasn't killed, as Uther was cunning enough to let at least one Dragonlord alive while he imprison the Dragon in the first place.