Lady Baela Targaryen was a daughter of Prince Daemon Targaryen and Lady Laena Velaryon. Her twin sister was Rhaena Targaryen. She was a dragonrider, whose dragon was Moondancer.
Baela's appearance is unknown. Baela was as fearless as her father.
Baela was born in Pentos. When she was half a year old, she and her mother and twin sister sailed from Pentos to Driftmark. In 117 AC she and Rhaena were presented to the King, Viserys I Targaryen, by their father, Prince Daemon Targaryen. Baela grew up on Dragonstone.
Towards the end of the civil war known as the Dance of the Dragons, as Dragonstone fell to King Aegon II Targaryen, Baela was able to escape from her bedchambers as the door was being smashed down. She managed to reach Moondancer in the stable where the castle dragons were kept. There she loosed her chains and strapped a saddle onto her. As Aegon II flew Sunfyre over Dragonmont's smoking peak and made his descent, Baela rose up on Moondancer to meet him.
The dragons fought in the pre-dawn sky, eventually slamming into the ground still fighting. Aegon jumped from the saddle twenty feet from the ground but Lady Baela stayed with Moondancer all the way down. Burned and battered she still found the strength to undo her saddle chains and crawl away from her dragon as Moondancer coiled into her death throes. Ser Alfred Broome drew his sword to slay Baela, but Ser Marston Waters wrenched the blade from his hand. Tom Tangletongue carried her to the maester.
Baela and her sister introduced Daenaera Velaryon to their half-brother Aegon III Targaryen, leading to the couple's marriage. Baela herself married her cousin Lord Alyn Velaryon and had issue.