Adda of Temeria

From Witcher Wiki

Princess Adda of Temeria was a daughter of Medell, king of Temeria and queen Sancia of Sodden, as well as a sister of Foltest, who became king after their father's death, and with whom she had an incestous relationship that resulted in pregnancy. This child was cursed (presumably either by Ostrit, who fell in love with Adda, or by Foltest's mother, who was highly furious about the incestous union of her son and daughter) and died just after its birth, killing her mother as well. Foltest ordered to bury them beneath his castle in Vizima. Seven years later, their daughter came back to life - but as a striga. The curse was eventually lifted by witcher Geralt of Rivia, and the young princess was named Adda, after her mother.