Ok just re-read comic version on Hedge Knight, and at the end Egg's father tells Ser Duncan he sent Aegon's elder brother the unruly Brightflame to Lys.
This is where Varys is to be from, and much speculation a secret Targ/Blackfyre, because of the sorcerer wanting his blood/cock and balls.
In my opinion from Cat's early KL POV Varys is a Sorcerer himself, secretly knowing the whisperers of his little birds.
It is stated second hand by Illyros in GoT, as heard by Arya near the dragon bones.
Illyros's second wife is said to be from Lys, and their heir may be FAegon, judging by Illyros' feelings.
The main thread is that FAegon is a Blackfyre, but what if he is of the Targ line from Brightflame.(Still not the real Aegon, born of incest)
I know it doesn't really matter, but adds to speculation of him being a bastard from one side(Targ) or the other(BF).
Please speculate as you wish on both 'the spider' and 'Young Griff.'