Here is how Daenerys Targaryen's Drogon is similar to Aegon the Conqueror's Balerion the Black Dread in Game of Thrones lore.

Pentos, you may recall, is where Daenerys (Emilia Clarke ... her they’re the hope for the Targaryen’s future—should war destroy them all, and their dragons, too—Rhaena realizes just ...