cassandra

She was sold to the King as a child, lost her best friend/possibly maybe soulmate, then her father polluted her head with ideas about how Rhaenyra will murder her and her entire family if she ever takes the throne, and she's subjected to marital rape over and over again by an old man whose flesh is quite literally sloughing off his body.

After decades of a lonely miserable existence she finally finds a chance to reconcile with the only person she was happy with in her entire life, only for it to fall apart literally the exact same night. She sacrifices that happiness because she genuinely believes it's her husbands will for Aegon to be made king, but then she's immediately confronted with the fact that almost none of the members of the royal court have ever respected her or valued her opinion.

She is then forced to confront the fact that her first born son, now the king, is a drunken rapist idiot who refuses to take his duty seriously and rejects any counsel he is offered. Her second born son is a violent lunatic who wants to murder his brother and rape his sister (and also now her, apparently). And her daughter has been subjected to incestual rape since she was a child, with more and more tragedies heaped upon her every day, further damaging an already fragile mind.