So Aurelion Sol's Intro Paragraph on the PBE reads as follows...
"Aurelion Sol once graced the vast emptiness of the cosmos with celestial wonders of his own devising. Now he is forced to wield his awesome powers at the behest of a space-faring empire that tricked him in to servitude. Desiring a return to his star forging ways, Aurelion Sol will drag the very stars from the sky, if he must, in order to regain his freedom."
So while stuff on the pbe is subject to change and the wording here might be changed somewhat, especially considering there's no quote from Aurelion Sol himself, it seems that our all powerful star-forging dragon is actually a slave! But to who?
Well given his VO it points to Targon as that empire, and not Targon the mountain, but Targon the city, specifically the city of gold and silver seen by Diana, Pantheon, Leona and Taric (Who's basically been confirmed to be an aspect at this point). Targon has, in Aurelion Sol's own words, used him as a weapon, and he really hates them. And given the way Aurelion Sol talks about Runeterra, it seems he's been trying to find his way there because he thinks (or just knows) that it holds the key to his freedom. How I don't know, but this is the most likely reason as to why there are four Targonian Aspects on Runeterra right now; they're prepping to deal with the mighty Star Forger, but now one has to wonder who the bad guy is here, since Aurelion Sol really just wants his freedom, and we don't know Targon's motives for tricking/enslaving him.
Some interesting details without even having seen his full lore yet! So guys, thoughts?