The Pendragon dynasty is the royal family at the heart of the Arthurian legend, and its founding is an act of deception. King Uther Pendragon desires Igraine, wife of Duke Gorlois of Cornwall; the wizard Merlin disguises Uther as Gorlois so he can enter Tintagel and lie with her the very night her true husband is killed in battle. From that union is conceived Arthur, the once and future king — born, from his first breath, of magic, adultery, and a stolen identity.
The family tree is a machine built for tragedy, because Igraine already has daughters by Gorlois. In Thomas Malory's telling, which this genogram follows, those daughters are Morgause, Elaine and Morgan le Fay — Arthur's half-sisters. Morgause marries King Lot and bears the great knights Gawain, Agravain, Gaheris and Gareth. Morgan le Fay becomes the sorceress who will scheme against Camelot for the rest of the cycle. Arthur himself marries Guinevere, but their union produces no heir — the one branch that should secure the dynasty stays barren, while the fatal branch grows elsewhere.
That fatal branch is incest, committed in ignorance. Before he knows they share a mother, Arthur lies with his half-sister Morgause, and she bears Mordred — the king's son and nephew at once, and the man fated to destroy him. The genogram makes the doom legible at a glance: the legitimate marriage to Guinevere is childless and is broken by her love for Lancelot, while the illegitimate, incestuous line produces the only son Arthur will ever have, and that son brings the whole Round Table down at the battle of Camlann.
This tree follows the version fixed by Malory's Le Morte d'Arthur (1485), the source most modern retellings inherit — but Arthurian genealogy is famously unstable, and earlier writers arranged it very differently. In Geoffrey of Monmouth's twelfth-century chronicle, Arthur's treacherous sister is named Anna and Mordred is merely a nephew, not a son; the incest is a later French invention layered onto the story. Whether Arthur himself ever lived remains one of history's open questions — no contemporary record names him — yet the family the medieval poets built around him became one of the most enduring and endlessly re-mapped genograms in Western literature.
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