Three Dragon Theory: Game of Thrones (Spoilers)

There are three dragons, are there three corresponding characters?

Leading contenders for the dragon having three heads…

Perhaps it wasn't patricide…

Hey George, I won't bug you about book 6 and 7, but do me a favor and don't get all creepy like Marion Zimmer Bradley…

Update:

Ned Stark spills the beans... (definite spoilers)
George RR Martin confirms  More from Ace