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A rondel dagger or roundel dagger was a type of stiff-bladed dagger in Europe in the late Middle Ages (from the 14th century onwards), used by a variety of people from merchants to knights. It was worn at the waist and might be used as a utility tool, or worn into battle or a jousting tournament as a side-arm.
The blade was typically long and slim, measuring 12 inches (30 centimeters) or more; the whole dagger might be as long as 20 inches (50 cm). Rondel means round or circular; the dagger gets its name from its round (or similarly shaped, e.g. octagon hand guard and round or spherical pommel (knob on the end of the grip).
The blade was stiff, made from steel, and the tang extended through the handle, which was cylindrical, normally carved wood or bone. In profile, the blade was usually diamond-shaped, lenticular, or triangular. These blades would have a sharpened point, and either one or both edges would also be sharpened. They were principally designed for use with a stabbing action, either underarm, or over arm with a reverse grip (think ice pick). They would also have been used for cutting. The long straight blade would not have lent itself to a slashing or saber action. Rondel daggers were ideal in battle for puncturing chain mail, and although they would not have been able to punch through plate armor, they could be forced between the joints in a suit of armor and helmets. This was often the only way in which a heavily armored knight could be killed.
A few examples also exist of four-edged rondel daggers, the blade having a cruciform profile. These blades would not have been suited for cutting, or use as a general utility tool; they would have been worn as a side-arm in battle. The rondel daggers which have survived and found their way into museums and collections are usually those with fine craftsmanship and often ornate decoration. The blades may be engraved, the grips ornately carved, and the hand guards and pommels highly decorated.
In a scene from a miniature by Girat de Roussillon depicting the construction of twelve churches in France (c. 1448), merchants and tradesmen can be seen wearing rondel daggers at their waists. Before the 15th century, daggers were actually a peasant's weapon. However, in the 15th century they became the standard side-arm for knights, and would have been carried into battles such as the Battle of Agincourt in 1415. They were a knight's backup weapon to be used in hand to hand fighting, and as such one of their last lines of defense. Since they were able to penetrate a suit of armor (at the joints, or through the visor of the helmet), rondel daggers could be used to force an unseated or wounded knight to surrender, for a knight might fetch a good ransom. Daggers may also have been thrown at unseated enemy knights to force them to engage in battle, though a mace was perhaps better suited to this task.
- Spotlight: The Rondel Dagger (myArmoury.com article)
- Overview of the 15th century knight's weapons and armor