A sax is a short sword that was used primarily during the early part of the Viking era. It's a one handed single edged weapon with a blade length ranging from 30 to 60cm (12 to 24 in). Saxes usually had simple fittings and no crossguard. Hilts were made of wood, bone, or horn.

Saxes had a characteristic blade-shape with parallel edges, a pointed tip, and a broken (rather than straight) back. A 7th century sax blade from Higgins Armory Museum is shown in the photo to the right, and a modern reproduction sax based on this example is shown in the photo to the left. The sheath is based on a find from Trondheim.

Compared to swords, saxes were typically more crudely fabricated. Rather than being crafted by skilled, specialized smiths, saxes were probably made by local smiths. Blades tended to be heavier and thicker than sword blades. The back edge of the sax blade shown above is nearly 8mm thick (3/8 in). However, not all sax blades were crudely fabricated. Some were pattern welded, like sword blades of the period, indicating a higher level of craftsmanship. The historical blade shown above and the reproduction based on it (right) are pattern welded.

At least a few sax blades were every bit the equal of the finest sword blades from the period. The reproduction sax shown to the right is based on an historical 8^th century sax found in the Netherlands. The inset image shows a detail of a small part of the blade. Like the historical original, this blade is a work of art, showing extremely fine craftsmanship.

Saxes were usually carried in a scabbard suspended horizontally from the belt. A 10^th century burial cross in a churchyard in Middleton, Yorkshire shows a warrior surrounded by weapons (right). The sax is shown suspended from his belt.

Different length saxes are sometimes referred to by different names, such as langsax or scramasax. However, the usual term that appears in the saga literature is sax and, rarely, but equivalently, höggsax and handsax.

Some people preferred a sax over a sword for fighting. In Grettis saga for instance, Grettir preferred his sax, called Kársnautr, which he took from Kár's grave mound.

One of the more memorable descriptions of the use of a sax in a fight occurs in Brennu-Njáls saga, at the fight on the Rangá described in chapter 63. Kolr thrust at Kolskeggr with his spear while Kolskeggr had his hands full with other opponents. The spear went through Koskegg's thigh. Kolskeggr stepped forward and cut off Kol's leg with his sax, and he asked, "Did that hit you or not?"

Kolr replied that it was what he deserved for not shielding himself. He stood looking at his leg stump.

Kolskeggr said, "You don't need to look: it's just as you think, the leg is gone." Then Kolr fell down dead.

The fight took place near the boulder Gunnarsstein adjacent to the Rangá river, shown to the right as it appears today.

We know little about how saxes were used. Some of the later medieval combat manuals teach the use of the falchion (left), a distant relative of the sax. Perhaps some of those techniques can be applied to the use of the Viking age sax, but to date, the work has not been promising.