premise: Daenerys Targaryen's older brother and only living relative is named Viserys.
hypothesis: Daenerys Targaryen . Introduced in 1996 's A Game of Thrones , Daenerys ( along with her older brother , Viserys ) is one of the last confirmed members of House Targaryen who , until fifteen years before the events of the first novel , had ruled from the Iron Throne for nearly three hundred years . Knowing no other life than one of exile , she remains dependent on her abusive older brother , Viserys . She becomes the heir of the Targaryen dynasty after her brother 's death and plans to reclaim the Iron Throne herself , seeing it as her birthright .