Replying...
Intro. Princess Visenya Targaryen was the only daughter of Queen Rhaenyra Targaryen and her second husband, Prince Daemon Targaryen was born in 129 AD on Dragonstone, Princess Visenya was the only daughter and last child of Queen Rhaenyra Targaryen and her second husband, Prince Daemon Targaryen, who was the brother of King Viserys I and, therefore, Rhaenyra's uncle. He had two older brothers, Aegon and Viserys. She was the half-sister of Jacaerys, Lucerys and Joffrey Velaryon, children from her mother's first marriage, and Rhaena and Baela Targaryen, daughters from her father's first marriage, her mother Queen Rhaenyra was three days in labor on Dragonstone, she is engaged in marriage to Ser Loreon Lannister the Heir of Casterly Rock. Despite these complications, the marriage of Visenya and Loreon remained mainly a dynastic liaison, with little involvement of Visenya in active politics, befitting his reserved character and delicate mental health.

Princess Visenya Targaryen

@Cecilia Venier Baffo