
Originally Posted by
Werthead
It's a tricky one. Cersei and Jaime are roughly 35 in AGoT, so would have been conceived in 262-263 AL. The problem with that is that Aerys II only took the throne and made Tywin his Hand in 262, and his reign started with him being fully sane. The cracks didn't start showing until a good few years later when Ilyn Payne said that Tywin was the real king, not Aerys, and Aerys cut his tongue out. Then he went really do-lally during the Defiance of Duskendale, which was likely in the early-to-late 270s.
So if we're assuming that Aerys sexually assaulted Joanna because he was crazy, that rules out Jaime and Cersei, but the timing works excellently for Tyrion (who was conceived around 271-272). If, OTOH, we assume he did it because he was an asshole even before he went crazy, (and after all, the wedding night where we know 'he took liberties' must have been before Jaime and Cersei's birth and probably their conception, so right around 262-263), then it's possible he's Jaime and Cersei's father.
'First night' was long gone by this time, however. Jaehaerys I abolished it when he took the throne in 40 AL or thereabouts, 230 years before Aerys became king.
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