Quote Originally Posted by Eldan View Post
Da'shain again:

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There was a nice theory floating around about Aegon, actually:

He's not a Targaryen. He's a Valyrian, but not a Targ.
Because in the same book, other Valyrians with similar white/purple colouring where first mentioned. The conspirators found themselves a baby in the correct colours and raised it as Aegon, then made up a nice true-prince-in-secret-exile story for the commoners to believe.
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This theory is pretty common and also ties in well with the Mummer's Dragon mentioned in Dany's visions from the House of Undying.