Renly poderia estar esperando Robert agir irracionalmente se Margaery se parecesse o bastante com Lyanna.
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O amor de Robert por Lyanna era uma obsessão (talvez até obsessiva), já que sabemos que o "sequestro" dela foi uma das principais razões para o início de sua rebelião.
Ned had loved her with all his heart. Robert had loved her even more. She was to have been his bride.
"She was more beautiful than that," the king said after a silence. His eyes lingered on Lyanna's face, as if he could will her back to life. Finally he rose, made awkward by his weight. "Ah, damn it, Ned, did you have to bury her in a place like this?" His voice was hoarse with remembered grief. "She deserved more than darkness …"
...
The king touched her cheek, his fingers brushing across the rough stone as gently as if it were living flesh. "I vowed to kill Rhaegar for what he did to her."
A Game of Thrones - Eddard I
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Até mesmo Cersei estava preocupada que ela seria substituída:
My husband grows more restless every day. Having Stark beside him will only make him worse. He's still in love with the sister, the insipid little dead sixteen-year-old. How long till he decides to put me aside for some new Lyanna?"
A Game of Thrones - Bran II
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Cersei também constantemente tentou minar Robert em algum momento, mesmo em público:
The mirth curdled on Robert's face. "The woman tried to forbid me to fight in the melee. She's sulking in the castle now, damn her. Your sister would never have shamed me like that."
A Game of Thrones - Eddard VII
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Robert não queria mesmo casar com Cersei em primeiro lugar:
I had no wish to marry after Lyanna was taken from me, but Jon said the realm needed an heir. Cersei Lannister would be a good match, he told me, she would bind Lord Tywin to me should Viserys Targaryen ever try to win back his father's throne," The king shook his head. "I loved that old man, I swear it, but now I think he was a bigger fool than Moon Boy. Oh, Cersei is lovely to look at, truly, but cold … the way she guards her cunt, you'd think she had all the gold of Casterly Rock between her legs.
A Game of Thrones - Eddard VII
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A mágoa de Robert é profunda:
"Rhaegar … Rhaegar won, damn him. I killed him, Ned, I drove the spike right through that black armor into his black heart, and he died at my feet. They made up songs about it. Yet somehow he still won. He has Lyanna now, and I have her." The king drained his cup.
A Game of Thrones - Eddard X
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Robert até cometeu um dos piores erros entre as folhas:
Her eyes burned, green fire in the dusk, like the lioness that was her sigil. "The night of our wedding feast, the first time we shared a bed, he called me by your sister's name. He was on top of me, in me, stinking of wine, and he whispered Lyanna."
A Game of Thrones - Eddard XII
Julgando a paixão, a fúria e a predileção por beber de Robert, Renly pode ter acertado que ele poderia convencer Robert de que Margaery era a nova noiva perfeita, porque ela se parecia com Lyanna. O fato de que Tyrells pode ser o único poder para desafiar os Lannisters foi apenas a cereja no topo do bolo ...