Every other story in this archive begins before the world; this one begins after an order has collapsed. Rome has withdrawn its legions, the high king Uther Pendragon is dead without an acknowledged heir, and Britain has splintered into a hundred quarrelling lords, each strong enough to burn a village and none strong enough to hold a country. Into that vacuum the legend places its two great engines: a prophet who can see the future, and a boy who does not know who he is.

The prophet is Merlin, enchanter, shape-shifter, counsellor to kings, and the true architect of everything that follows. It was Merlin who had arranged Arthur’s conception, disguising Uther as another woman’s husband; Merlin who took the newborn away as his price and hid him with a foster family, a king’s son raised as a nobody; and Merlin who, when the throne stood empty and the lords massed for civil war, set into a London churchyard a stone, and in the stone an anvil, and in the anvil a sword, with letters of gold that made a promise no ambitious lord could ignore.

“Whoso pulleth out this sword of this stone and anvil is rightwise king born of all England.

The great lords heaved at it and failed, one after another, all through the tournament held to test them. And then a boy named Arthur, squire to his foster-brother, sent back for a forgotten sword and finding the churchyard nearest, pulled it out without knowing what it was, simply because his brother needed a blade. The realm did not believe it. He was made to set it back and draw it again, before the barons, before the commons, again and again until no one could pretend it was chance. The most powerful men in Britain had spent their whole lives climbing toward a throne, and it went to a boy who lifted the sword because someone asked him to. The legend’s first lesson about kingship is that it is not seized. It is revealed.

A boy with a sword is not yet a king; a king is what he builds. Arthur’s wars to unite Britain were long and bloody, and the legend does not hide the blood, but what it remembers, what it built the whole cycle to remember, is the peace on the far side of the wars, and the astonishing thing he made in it. He took Camelot for his seat, married Guinevere, the fairest woman in the land, and received from her father, as her dowry, a great round table that would give its name to the finest fellowship the legends ever imagined.

Look closely at the table, because it is the whole political theory of Camelot rendered in carpentry. It is round. It has no head. At every other lord’s hall the seating was a map of who mattered, the powerful near the king and the rest ranged down toward the door, and every feast was a low war over the places. Arthur’s table abolished the map. A hundred and fifty knights, and no seat above another; the king himself merely one place at the ring. It was the first institution in the story of Britain built on the radical proposition that honour is a thing you do, not a place you are given, and around it Arthur seated the strength of the world and bound it by an oath.

“Never to do outrage nor murder; to flee treason; to give mercy to him that asks mercy; always to do ladies and gentlewomen succour; and never to force them. Unto this were all the knights sworn of the Round Table.

For one generation, it worked. The knights rode out to put down the very lawlessness they had been born into; the strong were made to serve the weak; the oath was renewed every Pentecost, and the empty places at the table filled with men who had earned them. This is the golden age the whole legend is elegy for, the brief, real thing that the rest of the story is the losing of. Because a fellowship this good has only one enemy strong enough to break it, and it is not any outside army. It is the flaws its own members carry inside the ring. And two of those flaws were seated at the table from the very first feast.

The genius of the Arthurian legend, the thing that lifts it above every simple tale of a good king and a bad enemy, is that Camelot is not destroyed from outside. It is destroyed by love and by the past, two forces no oath can outlaw, and both were present at the beginning. The first flaw arrived wearing the shape of the best of them. Lancelot du Lac, raised beneath the Lady of the Lake’s waters, came to Camelot and proved the greatest knight the Round Table ever held, Arthur’s dearest friend, his invincible champion, the model every younger knight measured himself against. And he and the queen, Guinevere, fell in love.

The legend is merciless in how ordinary it makes this. There is no seduction, no villainy, no spell, later tellers would try to blame a potion, but the great versions refuse the excuse. It is simply love, arriving where it must not, between two people who each love Arthur truly and betray him anyway, and hate themselves for it, and cannot stop. That is the wound that will not close: not a wicked act but a good man’s wife loving a good man who is not her husband. The Round Table’s whole strength was Lancelot; its whole meaning was the king’s honour; and the two were quietly at war inside the same triangle from the first year of the peace.

The second flaw was older, and worse, because it was Arthur’s own. Before he knew his parentage, before Guinevere, the young king had lain with a woman he did not know was his half-sister, and got a son on her. Merlin, reading the future, told him the truth in a single cold prophecy: that this child, Mordred, would one day destroy him and all his realm. Arthur’s response is the one genuinely ugly act the noble king commits, and the legend makes him pay for it forever: in a panic worthy of Herod, he had every child born that May-day set adrift on the sea to drown. Mordred survived. Of course he survived, you cannot drown a prophecy. The king who would build the age of justice began it by ordering the death of infants to escape his own past, and the past he tried to murder grew up, and came back, and kept the appointment.

At the height of Camelot, into the very hall of the Round Table, came the thing that would empty it. On a Pentecost, as the knights sat at the feast, the doors and windows shut of themselves, a beam of light seven times brighter than day fell across the table, and the Holy Grail, the cup of Christ’s last supper, the vessel that caught his blood, veiled in white samite and borne by no visible hand, passed through the hall, and every knight was fed with the food he loved best, and then it was gone. The whole fellowship, to a man, rose and swore the oath that would destroy them: to ride out and seek the Grail, and not return until they had seen it unveiled.

Arthur alone grieved to hear the vow, and the legend gives him the wisdom to see what the vow means before anyone else does. He knew, he said, that he should never see them all together again; that the fellowship he had spent his life gathering was, in this holy moment, dissolving; that the best company of knights the world had ever held would scatter across the wilderness after a vision, and most would die, and Camelot would never be whole again. The Grail is the most beautiful thing that ever enters the story, and it is also the beginning of the end, because it calls the knights to a perfection the Round Table was never built to reach.

“Now,’ said the king, ‘I am sure this quest of the Sangreal shall breed the death of the best knights of my realm; for they shall never come again until I am dead. And therefore I shall lose the fairest fellowship that ever was seen together in any realm of the world.

And the quest sorted the knights as heaven sorts, not as Camelot did. The bravest and the strongest, Lancelot above all, found the Grail barred to them, because prowess is not purity, and the affair with the queen shut the greatest knight out of the holiest sight; he came near enough to glimpse it through a door and was struck down for his nearness. The quest belonged instead to the few whose hearts were single: Percival, Bors, and above all the one knight made expressly for it.

The Grail was achieved by Galahad, and the legend’s treatment of him is one of its strangest and most revealing strokes. Galahad was Lancelot’s son, conceived, in the tales, precisely so that the perfection the father could not reach might be born in the child. He came to Camelot young, and sat without harm in the Siege Perilous, the empty seat at the table that killed any unworthy man who dared it, reserved from the first for the one knight who would complete the quest. He was flawless: chaste, humble, single-hearted, untroubled by the divided loyalties that tore every other knight in two. And he rode through the quest like light through water, achieving what the strongest could not, because the Grail answers to holiness and holiness alone.

When Galahad at last beheld the Grail fully unveiled, saw openly the thing the whole fellowship had shattered itself to glimpse, he did the thing that tells you what this legend finally believed about its own warrior world. He asked to die. Having seen the one sight worth seeing, he wanted nothing further from a life that could only be a descent from it, and his prayer was granted: he died in ecstasy, and hands from heaven took the Grail up out of the world, so that it was never seen on earth again.

“Now, blessed Lord, I would no longer live, if it might please thee. And therewith the good man took Our Lord’s body betwixt his hands, and Galahad’s soul departed to Jesu Christ, and a great multitude of angels bore it up to heaven.

Notice what the Grail quest has done to Camelot by the time it ends. The perfect knight is dead, having achieved the vision and left the world; the Grail is withdrawn to heaven; and of the great company that rode out, many never came back at all. The rest returned to a Round Table with empty seats and a spell broken, for the fellowship had gone seeking heaven, and heaven had shown them exactly how far short of it they stood. The best of them was gone up in glory. And now the two flaws left seated at the table, patient all these years, began at last to do their work.

What the Grail quest weakened, exposure destroyed. The love of Lancelot and Guinevere, an open secret survivable so long as it stayed unspoken, was at last forced into the light by knights who hated Lancelot, chief among them Agravain and Mordred, who cornered the king with proof he could no longer refuse to see. And here the tragedy tightens to its cruellest pitch, because every person in it does what honour demands, and honour demands ruin. Arthur, as king, cannot let treason pass; the law he built the Round Table to uphold requires the queen’s death by fire. Lancelot, as her lover and her knight, cannot let her burn; he storms the execution to rescue her, and in the fighting, blind in the press, kills two unarmed knights who were his own friends, brothers of Gawain, the king’s nephew and Lancelot’s truest comrade.

That accident is the hinge on which the whole realm turns to ruin. Gawain, who had loved Lancelot above all men and begged the king for peace, is broken by his brothers’ deaths into an implacable grief, and demands the war that Arthur least wants and cannot refuse. Now the Round Table is split three ways, the king’s men, Lancelot’s men, and the wound between them, and the fellowship that no outside army could beat sets about killing itself. The knights who had sworn never to fight but in a just quarrel now die by one another’s hands in a quarrel where everyone is right and everyone is doomed, besieging Lancelot in his own castle while, behind them, the throne of Britain sits unguarded.

And that unguarded throne is exactly what the past had been waiting for. While Arthur pursued his war against Lancelot across the sea, he left the realm, the legend twists the knife, in the keeping of his own son. Mordred. The doom he had tried to drown as an infant now sat in Camelot with the whole kingdom in his hands, and did what he had been prophesied from birth to do.

Mordred moved with the speed of a thing that has waited its whole life. He declared Arthur dead, seized the crown, and moved to take Guinevere for his own queen, the final desecration, the son claiming the father’s throne and the father’s wife together. Guinevere fled him to a walled tower and then, at the end of everything, to a nunnery. And Arthur, hearing that his own son had stolen his kingdom behind him, abandoned the war against Lancelot and brought his host home across the sea to a Britain that had turned, in his absence, into the exact ruin Merlin had foretold on the day the boy was got. The king who had spent his life building an order against chaos came home to find the chaos wearing his own blood’s face.

They met at Camlann, and the legend surrounds the last battle with omens and one last chance thrown away. A truce was called; Arthur and Mordred came to parley between the armies, and a settlement was near, until a knight drew his sword to kill an adder in the grass, and the flash of the blade, taken for treachery, set both hosts roaring into each other. So the greatest fellowship the world had known ended in a general slaughter begun by a snake and a misunderstanding, and by evening almost every knight of the Round Table lay dead on the field, and only a handful stood. Across the carnage the king saw his son.

“And there King Arthur smote Sir Mordred under the shield, with a foin of his spear, throughout the body. And Sir Mordred, feeling his death’s wound, thrust himself with the might that he had up to the burr of the spear, and smote his father Arthur with his sword through the helm and into the brain.

So the prophecy closed its circle. The son begotten in ignorance killed the father, as foretold on the day he was conceived, and the father killed the son, each the other’s doom, the beginning and the end of Arthur’s reign locking together on one spear. The age of justice ended on a field of its own dead, undone not by a stronger evil but by a single sin at its root that thirty years of nobility could not outrun. And Arthur, mortally wounded, still living, was left almost alone on the darkening field with one surviving knight, and one last thing to do.

The dying king gave his last command to Sir Bedivere, the last knight standing: take Excalibur, and throw it into the lake. Twice Bedivere went to the water and could not do it, the sword was too precious, the loss too total, and he hid it and lied that he had thrown it. Twice Arthur, hearing what the knight said he had seen, knew he lied: nothing had happened. Only on the third going did Bedivere hurl the great sword out over the lake, and an arm rose from the water, clothed in white samite, and caught Excalibur by the hilt, and brandished it three times, and drew it under. The magic Britain had borrowed from the otherworld went back into the otherworld. The age of the sword was over, and the sword knew it before the king’s knight could bear to.

“And there came an arm and a hand above the water, and took it and clutched it, and shook it thrice and brandished, and then vanished away with the sword into the water.

Then out of the mist came a barge, hung with black, and in it sat queens with crowns, among them Morgan le Fay, his own dark sister and long enemy, now weeping over him with the rest, as though at the end the legend could not tell his ruin apart from his mother-country’s grief. They took the king aboard, and Bedivere cried out that he was left alone, and Arthur gave him the answer that has kept the legend alive for eight hundred years: that he was going to the vale of Avalon to be healed of his grievous wound, and that Bedivere must comfort himself and pray for his soul. And the barge went out onto the water and into the mist and was gone.

And here the Matter of Britain does the thing that sets it apart from every other fall in this archive. It refuses to close the grave. Some said the king died and was buried at Glastonbury; but many would never believe it, and the legend itself leans their way, that Arthur did not die, but lies healing in Avalon across the water, and will come again in Britain’s hour of deepest need. On his tomb, the story says, they wrote no death-date, but a promise: Hic iacet Arthurus, rex quondam rexque futurus, here lies Arthur, the once and future king. Every other order in these tales ends; Camelot alone is written as merely paused. The golden age did not fail forever, the legend insists against all its own evidence. It went across the water, and it is coming back.