Aelor Targaryen

Aerys I Targaryen sat the Iron Throne without a son of his own, and over his reign he recognized a series of heirs, none of them born to him. That gap fell first to his nephew Rhaegel.

In 215 AC, Rhaegel died at a feast, choked by a lamprey pie. His death left the title of Prince of Dragonstone vacant, and it passed to his son Aelor, who suddenly became next in line to his uncle's throne.

Two years later, in 217 AC, Aelor died in a violent accident whose exact circumstances are unknown. He was killed by his own twin sister, Aelora, to whom he was married.

The episode left Aelora mad with grief, and the sources say nothing more about what happened between the twins.