Will Jaime kill Cersei, as he did the Mad King?
Robert’s Rebellion was effectively ended the day Jaime ignored his duty as a member of the royal Kingsguard and drew his sword on Aerys, killing him. Though the act earned him the title of "Kingslayer" and much derision across the land, it was a humanitarian effort – in his final moments, the Mad King threatened to burn the city of King’s Landing with wildfire to prevent the Lannister army from sacking it.
Jaime kept that detail secret, as it would presumably weaken his tough guy exterior. But the goodness in Jaime – however buried – has a way of poking through. This is why his proximity to Cersei could spell her doom.
There’s another big book clue that hints at Cersei’s fate: the Valonqar theory.
In A Feast for Crows, a young Cersei encounters a wood witch named Maggy the Frog who speaks prophetically of her future. When Cersei asks if she and the king will have children, the witch responds:
"Oh, aye. Six-and-ten for him, and three for you. Gold shall be their crowns and gold their shrouds … And when your tears have drowned you, the valonqar shall wrap his hands about your pale white throat and choke the life from you."
The "six-and-ten for him" bit refers to Robert’s bastards, and the part about gold shrouds foreshadows the death of Cersei’s children. But most curious is the use of valonqar, the High Valyrian word for "little brother." In the books, Cersei assumes that Tyrion will murder her, which is partly why she spites him. But fans have long predicted that valonqar might instead refer to Jaime, the younger twin, the person Cersei loves most. "We came into this world together, we belong together," she said in Season 1. Will they leave this world together, too?