A pernach (Russian: перна́ч, Ukrainian: пірна́ч, Polish: piernacz) is a type of flanged mace originating in the 12th century in the region of Kievan Rus' and later widely used throughout Europe. The name comes from the Slavic word перо (pero) meaning feather, referring to a type of pernach resembling an arrow with feathering.
A pernach or shestopyor ("six-feathered") was often carried as a ceremonial mace of rank by certain Eastern European military commanders, including Polish magnates, Ukrainian Cossack colonels and sotniks (cf. centurion).
- Caza, Shawn M. Medieval flanged maces