On a sword, the crossguard, or cross-guard, also known as quillons, is a bar of metal at right angles to the blade, placed between the blade and the hilt. The crossguard was developed in the European sword around the 10th century for the protection of the wielder's hand. The earliest forms were the crossguard variant of the Spatha used by the Huns, the so called Pontic swords .The crossguards were not only used to counter enemy attacks , but also to get a better grip on the sword.They were later seen in late Viking swords, and it  a standard feature of the Norman sword of the 11th century and of the knightly arming sword throughout the high and late medieval period. Early crossguards were straight metal bars, sometimes tapering towards the outer ends. While this simple type was never discontinued, more elaborate forms developed alongside it in the course of the Middle Ages. The crossguard could be waisted or bent in the 12th and 13th century.
Beginning in the 13th or 14th century, swords were almost universally fitted with a so-called chappe or rain-guard, a piece of leather fitted to the crossguard. The purpose of this leather is not entirely clear, but it seems to have originated as a part of the scabbard, functioning as a lid when the sword was in the scabbard.
In the 14th to 15th century, many more elaborate forms were tried. A feature of such late medieval forms is the cusp or écusson, a protrusion of the crossguard in the center where it is fitted on the blade. Also from the 14th century, the leather chappe is sometimes replaced with a metal sheet. An early example of this is a sword dated to c. 1320–40 kept at the Kelvingrove Museum in Glasgow. A later example is the "Monza sword" of Estore Visconti (early 15th century), where the rain-guard is of silver and decorated with a floral motif.
After the end of the Middle Ages, crossguards became more elaborate, forming first quillons and then, through the addition of guard branches, the basket hilt, which offered more protection to the unarmored hand.
Ewart Oakeshott in chapter 4 of his The Sword in the Age of Chivalry (1964) classifies medieval cross-guards into twelve types:
- a plain horizontal bar, tapering towards the end. This is the basic shape found from the late Viking era through the 17th century.
- waisted type, popular in the 15th century.
- a relatively short bar with a rectangular cross-section. Popular during 1150–1250 and again during 1380–1430.
- the terminals of the bar are bent towards the blade.
- "bow tie" style with widened and flattened terminals.
- a curved or bent variant of type 5.
- the bar has a flat cross-section and is bent towards the blade; popular in the 14th century.
- bent terminals as in style 4, but a more elaborate form with a hexagonal cross-section of the part fitted around the tang and a pronounced écusson, popular in the late medieval period.
- an elaborate late medieval type with the bar bent towards the blade and a flat diamond or V shaped cross-section and a pronounced écusson.
- the arms of the bar taper towards the hilt rather than away from it; mostly also with a pronounced écusson.
- knobbed terminals, with round or rectangular cross-section, popular during the 15th to 16th centuries
- the bar curves strongly in the horizontal plane, forming an S-shape; this type dates to the end of the medieval period and is transitional to the early modern quillon types.
The medieval dagger in the 14th and 15th century also adopted a variant with quillons, styled after the hilt of a sword. Quillon-daggers remained popular in the 16th century, after the sword type it resembled had fallen out of use.
- a quillon is "either of the two arms forming the cross-guard" (OED). The term arises in Middle French in the late 16th century, and is adopted in English only in the 19th century.
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- Frederick Wilkinson, Edged weapons, 1970, p. 71
- Ewart Oakeshott, The Sword in the Age of Chivalry (1964), chapter 4.
The piece ," the rain guard" that is Shawn, in fact play's the role of "the lock". I mean what prevent the blade to move inside scabbard loosely. That is - and was- very difficult to make that for the blade fit. Even if that would be possible, it would cost you your life: the first time sheath your bloody sward, it couldn't be drawn fast enough and you should quit your warriorship career.
- Oakeshott cross types (myarmoury.com)