Registered Cossacks

Zaporozhian Host
Active1572 - 1648
CountryPolish–Lithuanian Commonwealth
AllegiancePolish–Lithuanian Commonwealth
BranchArmy
TypeLight cavalry
Skirmisher
RolePatrolling
Raiding
Reconnaissance
Screening
Shock tactics
Wagon fort
Sizeup to 40,000 (1649)
Garrison/HQTrechtymirów (Trakhtemyriv), Kiev Voivodeship
EngagementsLivonian War, Moldavian Magnate Wars, Polish–Ottoman War, Polish–Muscovite War
Commanders
Notable
commanders
Petro Konashevych-Sahaidachny, Mykhailo Doroshenko, others
Ostap Dashkevych, ideologue of Registry Cossack Army
Registered Cossack's attire

Registered Cossacks (Ukrainian: Реєстрові козаки, Rejestrovi kozaky, Polish: Kozacy rejestrowi) comprised special Cossack units of the Polish–Lithuanian Commonwealth army in the 16th and 17th centuries.[1]

Registered Cossacks became a military formation of the Commonwealth army beginning in 1572[2] soon after the Union of Lublin (1569), when most of the territory of modern Ukraine passed to the Crown of Poland. Registered Cossack formations were based on the Zaporozhian Cossacks who already lived on the lower reaches of the Dnieper River amidst the Pontic steppes as well as on self-defense formations within settlements in the region of modern Central and Southern Ukraine.