The francisca (or francesca) is a throwing axe used as a weapon during the Early Middle Ages by the Franks, among whom it was a characteristic national weapon at the time of the Merovingians from about 500 to 750 and is known to have been used during the reign of Charlemagne (768–814). Although generally associated with the Franks, it was also used by other Germanic peoples of the period including the Anglo-Saxons, and several examples have been found in England.
The term francisca first appeared in the book Ethymologiarum sive originum, libri XVIII by Isidore of Seville (c. 560–636) as a name used in Hispania to refer to these weapons "because of their use by the Franks".
The francisca is characterized by its distinctly arch-shaped head, widening toward the cutting edge and terminating in a prominent point at both the upper and lower corners. The top of the head is usually either S-shaped or convex with the lower portion curving inward and forming an elbow with the short wooden haft. Sometimes the head is more upswept forming a wider angle with the haft. Most franciscas have a round or teardrop-shaped eye designed to fit the tapered haft, similar to Viking axes. Based on the measurements of modern replicas the francisca had a haft length of around 40–45 cm (16–18 in) and a 10 cm (4 in) cutting edge   with an average weight of around 600 g (21 oz, 1.3 lb). Based on surviving heads of franciscas recovered at Burgh Castle and Morning Thorpe in county Norfolk, England  the length of the head itself measured 14–15 cm (5–6 in) from the edge to the back of the socket.
...each man carried a sword and shield and an axe. Now the iron head of this weapon was thick and exceedingly sharp on both sides while the wooden handle was very short. And they are accustomed always to throw these axes at one signal in the first charge and thus shatter the shields of the enemy and kill the men.
Procopius makes it clear that the Franks threw their axes immediately before hand to hand combat with the purpose of breaking shields and disrupting the enemy line while possibly wounding or killing an enemy warrior. The weight of the head and length of the haft would allow the axe to be thrown with considerable momentum to an effective range of about 12 m (40 ft). Even if the edge of the blade were not to strike the target the weight of the iron head could cause injury. The francisca also had a psychological effect, in that upon throwing of the francisca, the enemy might turn and run in the fear that another volley was coming.
Another feature of the francisca was the tendency to bounce unpredictably upon hitting the ground due to its weight, unique shape, lack of balance and slight curvature of the haft, making it difficult for defenders to block. It could rebound up at the legs of opponents or against shields and through the ranks. The Franks capitalized on this by throwing the franciscas in a volley in order to confuse, intimidate and disorganize the enemy lines either before or during a charge to initiate close combat.
- Tarassuk, Leonid; Blair, Claude (1982). The Complete Encyclopedia of Arms and Weapons: the most comprehensive reference work ever published on arms and armor from prehistoric times to the present with over 1,250 illustrations. Simon & Schuster. p. 186. ISBN 0-671-42257-X.
- Underwood, Richard (1999). Anglo-Saxon Weapons and Warfare. p.35-37. Tempus Publishing. ISBN 0-7524-1910-2.
- Great Weapons of the Ancient World Number 52: The Francisca, retrieved 10-12-2011
- Gamble, James Douglas (2002). Axes of War and Power. Tanro Company. ISBN 0-9617220-1-5.