The Blood of the Dragon

The Blood of the Dragon is a belief about Targaryen difference that joins ancestry to custom, political identity, and supposed immunity from disease. It helps explain why the dynasty defended marriages forbidden by the Faith of the Seven, why Rhaena Targaryen invoked her descent in claiming Dragonstone, and why the death of Princess Daenerys during the Shivers struck at more than a family’s grief. The phrase promises distinction and protection; the history attached to it shows how uncertain both could be.

Ancestry, marriage, and religious conflict

The Targaryens’ kin-marriage tradition reached back to Valyria. Its rationale was that the blood of the dragon should remain pure: if brother-sister marriage was preferred, other close-kin matches could serve when that arrangement was unavailable. Some Valyrian sorcerer princes also took multiple wives, though this was less common than incestuous marriage. In Valyria, where many gods were honored and few feared, such customs met little open opposition. In Westeros, the Faith of the Seven condemned unions between close kin and considered their offspring abominations. The doctrine of dragon-blood purity therefore placed dynastic practice in direct tension with the Faith’s moral law.

That conflict did not immediately become open confrontation during Aegon Targaryen’s reign. The High Septons maintained courteous relations with the king and did not declare his marriages to his sisters lawful, while humbler members of the Faith continued to regard incest and plural marriage as sinful. Later, Exceptionalists offered a more explicit defense: Targaryens came from Valyria rather than Andalos, looked different from other people, and alone could tame dragons. Their difference, they argued, meant that rules for other people did not necessarily govern them. Septon Alfyn expressed the argument through an analogy between a lion and an aurochs: both might be noble, but neither could live by the other’s nature. His distinction did not deny the Faith’s rule for ordinary people; it claimed an exception for the blood of the dragon.

Descent as identity and entitlement

The belief could serve as more than a defense of marriage. When Rhaena sought an independent seat under Jaehaerys Targaryen, she argued that she had a stronger claim than her brother to Dragonstone because she was of the blood of the dragon and had been born there. Her appeal fused lineage with place: Dragonstone was not merely a castle she wanted, but her father’s seat and the home that expressed her dynastic identity. Jaehaerys agreed to grant her the island and castle, but carefully distinguished a royal gift from an inherent right. He would not allow the grant to make Dragonstone a separate kingdom. The episode exposes the gap between the force of Rhaena’s inherited identity and the king’s authority to define what that inheritance legally entitled her to hold.

Blood also mattered in the dynastic marriages intended to bind the realm. The Targaryens arranged matches between houses from distant regions, while Aegon’s son Aenys married Alyssa Velaryon, a descendant of Valyrian stock and a cousin of the king. These unions show that blood could mark both a boundary and a connection: the family guarded its own customs, yet marriage also linked its line to other houses and helped construct political alliances. The language of descent did not operate in isolation from the practical work of succession, kinship, and rule.

Dragons as proof—and as a test

The association between Targaryen blood and dragons made the claim visible. When Maegor refused a succession of dragon hatchlings, his failure became court gossip after his niece Rhaena bonded with Dreamfyre and took to the sky. Alyssa teased him about whether he feared dragons; Maegor answered that only one dragon was worthy of him. The exchange makes dragonriding a public measure of the identity he claimed, while Rhaena’s flight shows that the family’s supposed distinction was not simply secured by rank or assertion.

Septon Alfyn’s defense of Exceptionalism likewise made dragonriding central: Targaryens had been given the power to tame dragons, and he treated that power as evidence that they could not be judged by ordinary rules. The reasoning turns a visible ability into a broader claim about moral and social difference. Yet ability to ride dragons and immunity to illness were separate propositions. The first could be witnessed; the second rested on inherited belief and would face a devastating test.

The Shivers and the failure of immunity

During the plague on Dragonstone, Rhaena remained untouched as women among her companions and household fell ill and died. Maester Anselm suggested that her Valyrian blood protected her, and the pattern seemed to strengthen the explanation: apart from the elderly Maester Culiper, the victims described were women, while the island’s men remained healthy. Rhaena responded to the danger by closing Dragonstone’s gates to protect the smallfolk beyond its walls. Jaehaerys ordered Lord Velaryon’s galleys to prevent anyone from carrying the disease off the island, even though a young niece of Lord Velaryon’s was among those still there. Rhaena’s apparent survival thus seemed to offer immediate evidence for the old belief, but it did not establish that all Targaryens were immune.

The death of Princess Daenerys made that limitation impossible to ignore. She was Targaryen on both sides, and her parents had believed that the pure blood of Old Valyria placed their family beyond ordinary contagion. Yet she died of the Shivers. The event directly contradicted the conviction that fire in the blood of the dragon burned away every plague, a conviction that had extended beyond the Shivers to diseases including pox, bloody flux, and shaking sickness. The king and queen had to confront the possibility that Targaryens were not set apart from humanity as they had supposed. Their daughter’s death did not erase the dynasty’s ancestry, customs, or dragons; it broke the assurance that those things guaranteed immunity.

Meaning and limits

The Blood of the Dragon changes meaning across these episodes. It begins as a rationale for keeping marriage within the family and becomes a religious argument for exemption, a language of personal and territorial belonging, and an explanation for apparent resistance to disease. Each use relies on a different kind of evidence: inherited custom, visible difference and dragonriding, a claim to a family seat, or the observed survival of some individuals. The episodes do not make these claims equivalent. Rhaena’s survival during one outbreak could not prove universal immunity, just as descent alone did not settle the legal terms of her possession of Dragonstone.

The Shivers therefore gives the expression its sharpest reversal. Blood that had been treated as a shield against ordinary human limits could not save Daenerys. The loss exposed the vulnerability beneath the dynasty’s account of its own exceptional nature, without resolving every dispute about Targaryen identity or privilege. The phrase remains powerful precisely because it can support both an assertion of difference and a painful recognition that difference does not guarantee protection.