
So when we talk about potential hidden Targaryens, they are going to fit into one of three categories: trueborn Targaryens that were born within wedlock, Blackfyres, and Targaryen bastards. Only one of them-Daemon-actually founded a noble house (Blackfyre) upon being legitimized, while the others retained their birth surnames. While this is probably an exaggeration, my guess is that he probably fathered at least 50-100 bastards, who were all legitimized before Aegon died. While there isn't a definitive number known for the number of bastards that Aegon IV fathered, he claimed to have slept with at least 900 women. Fire and Blood were the words of House Targaryen, but Dunk once heard Ser Arlen say that Aegon's should have been Wash Her and Bring Her to My Bed."

He had legitimized the lot upon his deathbed not only the Great Bastards like Bloodraven, Bittersteel, and Daemon Blackfyre, whose mothers had been ladies, but even the lesser ones he'd fathered on whores and tavern wenches, merchant's daughter's, mummer's maidens, and every pretty peasant girl who chanced to catch his eye.

"Aegon's bastards had been the bane of the Seven Kingdoms ever since the old king had died.
