Ser Erryk Cargyll was sworn to one Targaryen and one alone; the Crown Princess Visenya, eldest child of Rhaenyra and Daemon and only daughter of the Queen. After the death of Queen Aemma, King Viserys stepped down as King to oversee the ascension of his daughter as the first Queen of the Iron Throne. Married to Prince Daemon, her uncle, the two were the height of Targaryen power across the Realm. Their daughter was to follow.