is the mad king raegar
Rhaegar Was the Mad Kingâs Heir: At present Daenerys is the only known living member of the Targaryen family on âGame of Thrones,â but there was once a time when their lineage was strong in Essos. Rhaegar was one of the Mad King, Aerys Targaryenâs, three children from his marriage to his sister, Rhaella Targaryen. Rhaegar had both a brother/cousin, Viserys Targaryen (Harry Lloyd), and a sister/cousin, the Mother of Dragons.