Game of Thrones‘ most devastating episode came as a shock to many viewers, but “The Rains of Castamere” isn’t surprising after Robert’s Rebellion. Robert’s Rebellion predates the events of Game of Thrones, but in many ways, it’s responsible for them. Robert Baratheon’s war against the Targaryens leads to many of the alliances and enmities seen in the HBO series, setting Daenerys on her path to claim the Iron Throne. In addition to setting such events in motion, this uprising also reveals a lot about the characters who are present for it.