The Swedish Hednalagen, (Pagan law) is a fragment from a 13th century document from Västergötland in Sweden, which stipulates the conditions for a holmgang:
• If someone speaks insults to another man (”You’re not the like of a man, and not a man in your chest!” – ”I’m a man like you!”), they shall meet where three roads meet. If he who has spoken comes and not the insulted one, then he shall be as he’s been called: no right to swear oaths, no right to bear witness, may it concern man or woman.
• If the insulted one comes and not he who has spoken, then he shall cry ”Niðingr!” three times and make a mark in the ground, and he is worse who spoke what he dared not keep.
• Now both meet fully armed: if the insulted one falls, the compensation is half a weregild; if he who has spoken falls, insults are the worst, the tongue the head’s bane, he shall lie in a field of no compensation.
In Kormakssaga, it’s stated that holmgang was fought on an ox hide or cloak with sides that were three meters long. The hide or cloak was staked to the ground in a specific manner that is unknown. Then the area was marked by drawing three borders around the square hide, each about one foot from the previous one. Corners of the outermost border were marked with hazel staves, and holmgang combatants had to fight inside these borders. Stepping out of borders meant forfeiture and running away meant cowardice.
Also in the Saga of Kormak is mention of a sacrifice of a bull before the holmgang and there are many references about the sacrifice the winner made after the victory. In this saga, it’s stated that holmgang combat would normally end on the first blood and the winner would receive three marks of silver. This was intended to avoid unnecessary loss of life and excessive profiteering, and is confirmed in later Icelandic versions of holmgang. If the dispute was about a specific property, the most the winner could receive was the three marks of silver.
To begin a holmgang, the challenger had to recite the rules, traditional or those agreed upon, before the duel could begin. Rules determined the allowed weapons, who was eligible to strike first, what constituted a defeat or forfeiture. In Gunnlaugs saga, it is stated that when a man became weaponless, he was defeated, but losing a weapon did not necessarily mean defeat, as a duelist could use glima. In Egils saga, it’s said that Egill killed Atli in a duel by grappling with him and biting out his throat.
Some holmgang duels were resolved quickly, such as the one described in Víga-Glúms saga, where Eyjólf's first blow cut off Ásgaut's foot. Ásgautur then paid his opponent to release himself from the duel, and lived the rest of his life as a cripple. Some holmgang duels went on for a long time, and Þorsteins þáttur stangarhöggs tells of a duel between Þórsteinn and Bjarni that lasted so long that they stopped multiple times to rest and refresh themselves.
In Ljósvetninga saga, another form of holmgang is mentions. Here, the duel has four men on each side. The challenge was offered by Hrólfur as either a duel one on one with his opponent Eyjólfur, or with four men on each side. It was agreed that the challenger had the privilege of choosing who the additional men would be on each side, and Hrólfr chose mercenaries and robbers to fight alongside him.
If a holmgang ended with the death or incapacitation of a combatant, it was not considered murder, and the winner could not become outlaw, or have to pay weregeld. To win a duel was regarded as proof that the winner was in the right, because the Norse gods always helped the "right" man to win. The Norse god Tyr was often called upon for in a Holmgang, as Tyr was the Viking god of dueling and justice.
If the person challenged did not turn up for the holmgang, the challenger was considered the winner. If the offended party did not turn up for the holmgang, they were deemed niðingr (nithinger), meaning a nothing-person. This was a social stigma implying the loss of honor, with the status of coward or villain, and such a person could be also sentenced to outlawry.
Because of the massive consequences of holmgang, if a person was clearly outclassed, unable or unwilling to defend their claim, a capable warrior could volunteer to fight in their place. The law also gave a person involved in a dispute the right to choose a warrior to fight in their stead. This led to Viking warriors traveling from thing to thing as professional duelers, fighting for someone who didn’t have the ability or means to fight for themselves.
In most instances, both parties agreed to what the winner would receive, but in Norway, the winner of a holmgang could claim everything the loser owned. With such stakes, professional Viking duelists used Holmgang as a form of legalized robbery. Some claimed rights to land, women, or property, and proved their claims in a Holmgang duel, at the expense of the legitimate owner. Many sagas describe berserks who abused holmgang in this way. With this abuse of the Viking legal system, Holmgang duels began to be outlawed in the Nordic countries.
Gunnlaugs saga ormstungu, "the Saga of Gunnlaugr Serpent-Tongue", describes the last duel to take place in Iceland, in the 11th century. This saga is about two Icelandic poets, Gunnlaugr Ormstunga and Hrafn Önundarson, and their love of Helga the Fair, granddaughter of Egill Skallagrímsson. Their competition for Helga resulted in a duel of honor at the Alþing, which ended as a draw. The next day, the law council abolished duels in Iceland. Gunnlaugur and Hrafn traveled to Norway to continue their duel, in which Hrafn killed Gunnlaugur, only to die himself shortly thereafter.
Christianity changed the Holmgang to an ordeal by fire. Járnburdr is the Old Norse name of the ordeal of grabbing a hot iron from boiling water and walking 9 paces with it carrying it with both hands to prove innocence.
With the increasing popularity of Viking fighting, friendly holmgang competitions regularly take place at Viking festivals around the world. These modern Viking duels are exciting to watch and thrilling to take part in, whether it is in training, show, demonstration or competition, and although they are not fought to first blood or death, there is still the element of danger and injury from the blunt steel weapons used.