Did you know/119
... one of the earlier drafts of the Targaryen family tree, dating circa 1998, had Alysanne Targaryen as the daughter of King Maegor I Targaryen? Not much later George R. R. Martin changed the family tree and Alysanne became the daughter of King Aenys I Targaryen, Maegor's older brother, instead. As a result of this change, Alysanne's husband, Jaehaerys I Targaryen, became her brother instead of her cousin.
- asoiaf.westeros.org: The Book of Swords - The Sons of the Dragon SPOILERS (August 28, 2018)