Vervelles are small metal staples used in Medieval armour to attach an aventail to a helmet. A leather cord would be woven through the top row of rings and the vervelles, securing the two together.
References
Vervelles Wikipedia(Text) CC BY-SA
Vervelles are small metal staples used in Medieval armour to attach an aventail to a helmet. A leather cord would be woven through the top row of rings and the vervelles, securing the two together.