15He Married Both Of His Sisters
Fans of Game of Thrones have spent plenty of time both reading and watching incestuous relationships unfold throughout the series. This is one of the more noteworthy elements of Cersei and Jaime Lannister, and it's since become a new ripple in the relationship between Daenerys and Jon Snow. It's been
mentioned before that the Targaryen bloodline was kept pure by people marrying within the family. Aegon the Conqueror was no stranger to this, though instead of going the usual route and taking one bride for himself, Aegon decided to marry both of his sisters.
Both of his sisters became nearly as famous as Aegon the Conqueror because of their efforts in his conquest of Westeros. Following their Targaryen heritage, all three were renowned for riding dragons into battle, and their efforts ultimately led to success. Say what you will about marrying both of his sisters, but this move turned out to be a stroke of genius by Aegon.