What was a berserk? The warrior behind the word

Everyone knows the word. To go berserk is to lose all control, to fight or rage without limit. What fewer people know is that the word is a genuine piece of the Viking age, and that the warrior behind it was a real, and rather alarming, figure.

A word worth getting right

First, a small point that matters to a couple of authors who fuss over these things. The Old Norse word is berserkr. We tend to say “berserker” in English, but that final “-er” is something we bolted on later. The original word was already complete: the “-r” on the end is just Norse grammar, the way “wolf” becomes úlfr. So the truer, older form is simply berserk. One word, no spare parts. It’s why we called the fourth book in our other series Rage of the Berserk, and not Berserker.

And what does it mean? Almost certainly “bear-shirt”. Ber from bjørn, bear, and serkr, a shirt or sark. A man who wore the bear. There’s a competing theory that ber means “bare”, as in fighting without a mail-shirt, and honestly nobody can prove which is right. But bear-shirt is the reading that has stuck, and it fits what we know of them.

Bears and wolves

The berserk had a cousin: the úlfheðinn, the “wolf-coat”, a warrior who fought in the skin of a wolf. Both were associated with Odin, and both seem to have gone into battle in a state that later writers struggled to describe. The word for it was berserksgangr, the “going-berserk”. Our own Geir Galne, the wolfpelt, comes straight out of this tradition.

The fury

Our best-known description comes from Snorri Sturluson, writing in the thirteenth century, long after the fact. He describes warriors who went without armour, mad as dogs or wolves, biting their shields, strong as bears, cutting men down while neither fire nor iron seemed to touch them. It is a wonderful, frightening image, and we should treat it with some caution, since Snorri was recording a memory of something already old and half-legendary in his own time.

What actually caused the state, nobody knows for certain. The theories range from religious ecstasy in the cult of Odin, to a self-worked psychological frenzy, to sheer trained group fury, to various intoxicants: mushrooms, henbane, strong drink. All of it is plausible, none of it is proven. The honest answer is that we don’t know, and I’ve made my peace with that.

Too dangerous to keep

Here’s the detail I find most telling. A man who could drop into an unstoppable killing rage is a fine thing to have in a shield-wall and a nightmare to have in your village the rest of the year. Over time, as Norway and Iceland settled and took on Christian law, the berserk went from prized warrior to public menace. Later law codes actually banned berserksgangr outright. Going berserk stopped being a battlefield asset and became a crime.

There’s a whole story in that shift, from the war-band to the law-book, and it’s the kind of change our books live right in the middle of.

Where to meet one

If you’d like to see a berserk on the page rather than in a footnote, Geir Galne carries his fury through Rage of the Berserk. Fair warning: he is not a calm man.