The Helmet is the 'piece of armor, which covers and defends the head'. In the first medieval centuries, a simple metal helmet was used to protect the head, conical in shape, without visor or jugulars, to which the straight nasal appendage was added in the 10th century. Later, the visor was added, the mobile part and the most important part of the helmet or helmet, intended to cover the face of the warrior during the fight, which was raised when there was a need to take a breath and better examine the objects. In the Middle Ages it consisted of three parts:
- the visor itself, in which there were holes or slits to provide the free passage of air and facilitate vision: this part defended the eyes
- the nasal
- the window
The visor is a very old invention as it is seen in the helmets of the Greeks and Etruscans as well as those used in the 10th century and later.