House of the Dragon's conflicts can be traced back to Aegon I Targaryen ... concept for 21st-century real-world audiences, but the unity of both houses would have solidified the realm. Instead ...

Viserys is the eldest Targaryen fans have been visually introduced too. He is the fifth king in the dynasty, son of Prince Baelon and his wife/sister Alyssa, descendent of Aegon I, the Conqueror.