Season 8 of 'Game of Thrones' premiered today and boy, oh boy, has it given new light to a particular theory that we've been speculating for so long.
Cersei Lannister was introduced to us as a cruel, conniving Queen who was willing to cross any lines when it came to protecting her kids and lover/ twin brother Jaime. We've hated her initially and then we grew to admire her for her unpredictable moves that would challenge the whole sequence of events (remember the burning of the Sept?) all orchestrated seamlessly.
A major motivation and central to her arc is the Prophecy that Cersei was made acquainted to as a little girl.
While going deep into the woods around Casterly Rock, Cersei stumbled upon an old woman called Maggy the Frog, who turned out to be a powerful fortune teller. Cersei asked Maggy three questions about her future, however, the answers weren't hopeful. The first said that she wouldn't marry a Prince, but a King. The second said that she would be cast down by a younger and a more beautiful queen who would take all that she held dear. Further, Maggy told Cersei that the king would have 20 children, but that Cersei would only have three, and “gold will be their crowns, and gold their shrouds.”
Now, of all the three predictions, Margaery Tyrell did manage to take away most of what Cersei held dear to her including her son, Tommen but besides these three predictions, in 'A Feast for Crows', the fourth book in the series, Maggy reveals to Cersei one final part of the prophecy: “The valonqar shall wrap his hands about your pale throat and choke the life from you.”
Now, here the valonqar translates to a younger brother. For Cersei, this has always been Tyrion as someone who could possibly try to kill her.
However, if you notice, there is this other 'younger brother' in Cersei's life. Yes, we're talking about Jaime Lannister.
After watching the first episode, this prediction could come to life, because Cersei has commissioned Bron to assassin Jamie. If this fails, Jamie could possibly come after Cersei because he's clearly repulsed by Cersei's rule, which is like the Mad King in more ways than one.
To begin with, Cersei made Tyrion believe at the end of the seventh season that she would send the Iron Fleet to help fight The Army Of the Undead. This obviously, was a lie which Tyrion failed to see through for a change. She couldn't care less about the White Walkers or the impending doom as long as she could save herself from it.
In the fifth episode of season 7, Cersei told Jaime that she was pregnant. Now, in the premiere of season 8, she consummated her alliance with Euron Greyjoy because the only way she could keep the Iron Fleet and have her way around with it was if she would sleep with Euron which, to her seemed a small price to pay.
Now, Euron telling Cersei “I'm going to put a prince into your belly” is practically impossible — if, indeed, Cersei is still pregnant.
It's unclear, however, if that's the case. If you recall, Cersei nixed drinking last season when she realized that she was pregnant. But in today's episode, she was seen sipping a glass of wine after sleeping with Euron. While the Westerosi doctors probably aren't warning Cersei against fetal alcohol syndrome, the change could signal a change in Cersei's status.
Regardless of whether Cersei is pregnant or not, she's likely to lose her baby at some point to that effect taking into account how things are moving. But the question is if a majority of the theory has come to pass, as we are still waiting to see who will be the vanquisher of Cersei. It could still be Tyrion, if Jaime ends up getting executed or killed before or during the battle of Winterfell.
It could also be Euron Greyjoy. Technically he is the younger brother of Balon Greyjoy and passes the criterion of a valonqar if he realizes that his relationship with Cersei is not based on trust and she could betray him any time.