Christianity made steady headway through the new peoples, but the potency of such traditions was such that it was converted almost as much as the pagans were. The idea that the morality of a deed depended on the doer’s state of mind, though seen throughout the Bible and common among the Athenians and Romans, steadily gave way to a sense that acts were good or evil, regardless of intention. Christianized rulers often enacted laws based on the Bible but, keenly aware of the fragility of their authority, generally did very little to enforce them.
Laws were not, however, abandoned. Although rulers could not make their subjects be good, they began to establish some control over their feuds and squabbles by fixing guidelines for compensation, and asserting that complainants could resort to violence only as a last resort. The tariffs varied depending on the seriousness of the offence. The laws of the Salian Franks, written down towards the end of the fifth century AD, required three shillings from those who defamed someone by calling them a fox or a hare. Abducting a virgin in Kent a century later entitled her owner to fifty shillings. Among the Frisians of the late eighth century, the value of a life ranged from cost price, for a slave, to eighty shillings for a nobleman.
Such codes hardly made for the rule of law, but each reflected the development that Aeschylus had once idealized in the Oresteia: the attempt to formulate collective justice as an honourable substitute for private revenge. The same process seems to occur whenever a community becomes sufficiently self-aware to recognize that it has disputes to resolve. Cultures around the world have used countless different methods to contain the violence. Among the Inuit of Greenland, disputants once abused each other in song and proved the superiority of their claims through feats of great athleticism. The Tiv of Nigeria chanted insults at their opponents, and tied them to trees. Massa clans in Cameroon–Chad used to thrash out their differences by fighting huge battles with very small twigs. And the proto-litigants of medieval Europe relied on a very particular technique of their own – the oath.
The oath has probably been guaranteeing truth for as long as humanity has been able to envisage a power more vengeful than itself, and the promise to the divinity concerned has always been a terrible one. Accuser and accused in an Athenian murder trial would swear on their children’s heads while standing atop the entrails of a boar, a ram, and a bull. One method of renewing the Covenant among the ancient Hebrews involved walking between the two halves of a bisected calf. Medieval Christendom used tokens of mortality no less fearsome, typically the body parts of saints, and oaths formed the basis for its earliest trials – ceremonies known as compurgation, at which defendants proved their innocence by gathering together people willing to swear to their cause.
The ritual was enshrined in writing in the very first barbarian law codes, and by the seventh and eighth centuries it was being practised across Europe. Under open skies, each member of the team – known collectively as compurgators, conjurors, or jurors – would swear upon a shard of holy shinbone, say, that the defendant had not committed the alleged crime. The number of witnesses required depended on factors that ranged from the status of the suspect to the nature of the offence. Queen Uta of Germany, accused of adultery in 899, was acquitted only after eighty-two knights stepped forward to confirm her chastity. It would have taken six hundred people to acquit an accused poisoner in Dark Age Wales. On the other hand, those lucky enough to be deaf, dumb, aristocratic or pregnant were often accorded special privileges, and anyone accused of crime in seventh- and eighth-century Spain was downright lucky. Suspects who swore to the baselessness of charges laid against them were not only absolved of guilt, but also awarded compensation at the expense of their accusers.
Such proceedings, though reliant on witnesses, were not inquiries. The oath, far from ensuring the reliability of evidence, was the evidence; and jurors swore to their support of a defendant rather than to what they knew of a case. One consequence was that they were liable in some places to punishment for perjury if they got it wrong. Another was that any formal defect in the ceremony allowed people to lie with impunity. Swearing falsely on a saint’s relics was ordinarily a one-way ticket to hell, but if the reliquary was empty – because, for example, the testifier had secretly removed its contents – a person could swear that black was white with no ill effects at all. Similarly, it was a grievous sin to speak falsely to a priest while holding a consecrated cross, but fine to clutch the crucifix and lie blind if the only people present were non-clerical. In medieval Europe, breaking a promise was of little consequence. The fault lay in doing so after God had been asked to watch.
At the end of the first millennium AD, attitudes towards criminal justice in Europe therefore stood at a cusp. Religious and secular authorities were trying to encourage individuals to give courts a chance before taking matters into their own hands, but the belief in vengeance remained alive and well. The passions of the feud were being accommodated rather than ignored, and they were always liable to spill over beyond the institutions designed to contain them. No tale better captures the frailty – and peculiarity – of the attempts to tame gang warfare with the oath than the Icelandic Saga of Burnt Njal.
The story was written almost three centuries after the island’s conversion to Christianity in AD 1000, but it depicts a land rumbling to rhythms far older: a volcanic place of trolls and sprites, where the earth would more likely shrug its shoulders than a man would turn the other cheek. Feuds erupt and cool throughout the fifty years spanned by the work, but the narrative hinges at a point when men loyal to a chieftain called Flosi burn the eponymous Njal to death in his farmhouse. Njal and his wife steadfastly await the flames from the discomfort of their bed and his immediate family chooses to perish alongside him, but one relative determines to escape. Nephew Kari Solmundarson clambers to the rafters and, treading timbers that are sweating smoke, reaches the edge of the building. Seconds after he leaps from the roof, his hair and clothes ablaze, it crashes to the ground. After dousing his sorrows in a nearby stream, he embarks on the mission that will make his name a byword for good fortune throughout Iceland. In agony though he is, disfigured though he is, and bereaved though he is, Kari is also very, very lucky. He has survived to seek revenge.
Outrage mounts as he moves from kinsman to kinsman with news of Flosi’s crime. Thorhall Asgrimsson, a foster son to Njal, is so apoplectic that blood spurts from his ears and he collapses to the ground – a moment of weakness for which he expresses great shame – but he will prove a stalwart ally. For Thorhall Asgrimsson possesses a quality that is hardly less magical than good luck: knowledge of the law. And Njal’s friends and kinsmen agree that it is time to exact an awful revenge. They will take the killers to court.
On being given notice of suit, Flosi ponders whether to settle the case, but is persuaded by a fellow arsonist that, having shown such defiance, it would not be proper to back down. He decides instead to engage a lawyer. After ruling out one candidate, a warrior’s kinsman, on the basis that whoever takes the job is likely to die, Flosi approaches Eyjolf Bolverksson, one of Iceland’s most formidable pleaders. Eyjolf, resplendent in scarlet cloak, gold headband, and silver axe, initially refuses to have anything to do with the case. He is no cats-paw, he declares, ready to meddle in a dispute that has nothing to do with him. Flosi, confronted with a lawyer who speaks of integrity, knows just what to do. He dangles a chunky gold chain from his arm, and Eyjolf rapidly reconsiders. ‘It is only proper for me to accept this bracelet in the face of such courtesy,’ he purrs. ‘And you can fairly expect that I shall take over the defence and do everything that may be required.’ It was a bad move. Icelanders, like virtually every people before and since, had contempt for anyone so dishonourable as to require money to plead for someone’s rights. Eyjolf’s fictional fate was sealed.
The trial takes place on one of Iceland’s endless summer days at the Law Rock, a lava cliff overlooking a large valley and a silver river snaking far below. From across the island, jurors, chieftains, and onlookers converge around the booths that contain the legal teams. All the lawyers are, as is traditional, armed to the teeth and in full battle regalia. On the Rock itself stands Skapti Thoroddsson, the omniscient Law Speaker, who bears the awesome responsibility of memorizing the law and publicly reciting a third of its provisions every year. Kari’s nine jurors are sat on the riverbank, their job not to assess evidence but to swear