Princess Helaena Targaryen is the third daughter of Viserys I Targaryen and the first daughter of his second wife, Alicent Hightower. Helaena grew up in a family divided. Her mother raised her and her siblings to believe that her elder sister, Rhaenyra, was stealing her brother Aegon Targaryen's birthright and that they should be angry at her for it. Like the rest of her siblings, Helaena enjoyed a cool relationship with her elder sister and step-mother. However, aside from her youngest brother, Daeron, she also had the least antagonistic one. She eventually married her elder brother, Aegon, and they had three children together. Theirs was not a happy marriage, though, as she was said to be in love with a lesser nobleman and was forced to give up her pursuits of him. She is a dragonrider to the dragon Dreamfyre, one of the oldest dragons in the realm.

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