Princess Daenerys Targaryen is the daughter of King Aerys II Targaryen and Queen Rhaella Targaryen. She was born near the end of Robert's Rebellion and was spirited away alongside her mother and elder brother Viserys Targaryen to the Free Cities for safety. For much of her life, she lived safely in Braavos, where she was raised by her mother and Ser Willem Darry of the Kingsguard. When she was nine, though, Ser Willem died, and her family was forced to go on the run.
For eight years, the family moved in secret before coming to the resident of Magister Illyrio Mopatis. The man offered them sanctuary, and then he helped Viserys arrange a marriage between Daenerys and the Dothraki Khal Drogo. Rhaella found out about it, though, and put a stop to it, saving Daenerys.