TheAncientCelt
The Leech Lord
That would be the one, he fed his own sister Queen Rhaenyra to his dragon after pretty much being absent from the war through its entirety after an injury sustained early on. He wasn't very pleasant.
Yup. His aunt, sister? The queen who never was, injured him in one of the first battles, married to the Lord of Driftmark, and paid the ultimate price for it in the end. I 'member it all a bit clearer now.
I'll have to make sure to do the same to any dragon riders in this war, when Viserys gets involved.