Mysaria, the white worm, is descended from Princess Saera, who ran off to the Free Cities, and when she had the chance started to take down the Targaryens turning on both sides.
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Not only Mysaria I think Saera and Aerion & Maegor's lineages are really important along with Aemond's!
Possible bastards of Saera - Alicent Hightower - conceived right after Saera ran away from mother house, Lord Hightower kept her place a secret from Jaeherys because she had a relationship with Otto. - Mysaria of Lys - conceived in Lys? - A son tied to House Rogare and or Serenei of Lys ? - A son tied to Volantis, specifically to Nymeria Sand's mother? - Saera Mopatis - a distant relative born when Saera' wealth and power diminished in Essos thus sold to slavery
Added to this I think Viserys II might be fake or Larra Rogare might have a bastard when she wed Viserys so Aegon IV might not be true born. In first case I think it is possible both decoy Viserys and Larra are Rogare's and related to Saera Targaryen. We know Daena should be Queen because she was wife and sister of Baelor yet had a bastard son. Interesting she never revealed the father until Aegon claimed Daemon after twelve years. I think Daemon doesn't favor Aegon at all and instead reminds me Aemon the Dragonknight, what if Aegon IV was somewhat right and Aemon did have a bastard? With Daena? Daemon and Aegor after their investigation seemed to believe Daemon was the rightful King and not Daeron, I don't think they come to this conclusion because Naerys was unfaithful but because they found out Aegon III line was the true Targaryens and thus Daemon was King through his mother's spurned claim. Because it is 4 am and I am still not asleep.