Aemma Arryn
Viserys's first queen, an Arryn of the Eyrie with Targaryen blood of her own — wed at eleven, worn out by the cradle and the crypt in equal measure.
The fuller tale
Viserys's first queen is an Arryn of the Eyrie with Targaryen blood in her own lineage, wed to her cousin at eleven years old in the kind of match the family considers unremarkable and modern readers generally do not. She spends the following years almost entirely in service to the one job her marriage was arranged to accomplish, worn down by a succession of pregnancies that end, again and again, in miscarriage or a child who does not survive infancy — every loss recorded, coldly, as the realm's business rather than hers.
Rhaenyra is the single child who lives past the cradle, and Aemma's later years are spent watching her husband's court quietly wonder, in her hearing and out of it, when she will finally produce the son the succession is assumed to require — a pressure that does not relent even as her body's ability to survive another attempt visibly declines.
The page and the screen
Both tellings agree on the essential cruelty of Aemma's final labor and its aftermath; the show dramatizes the birthing chamber scene directly and at length, with Viserys forced to choose between his wife's life and his hoped-for son's in real time. Fire & Blood records the same event more clinically, as history rather than scene, but the outcome and its consequence — a grieving king who, soon after, names his daughter his heir — are identical in both versions.
Where they stand, season by season
Their fate — if death has found them, it is written here. Open at your peril.
The show: Died in the birthing bed (S1·E1)
The books: Died in the birthing bed (F&B, ch. 1)
The maesters gave Viserys the choice no husband should hold: the mother or the child. They cut her open on the birthing bed to free a son who lived a day, and she died knowing what was happening and why. The king carried the choosing to his own deathbed.
In the show, Aemma's labor turns fatal and Viserys, presented with his maester's grim choice, authorizes a procedure to save the child rather than the mother. She dies aware of what is being done to her and why; the son bought at that price, Baelon, survives her by only a few hours.
Fire & Blood records the same childbed death in 105 AC in flatter historical terms — Aemma dies delivering the son Viserys had prayed for, and the boy does not outlive the day. The court mourns formally and moves on; the succession question the death quietly opens does not surface fully for two more years.