page_title: Registered Cossacks
hierarchical_section_title: Registered Cossacks
caption_attribution_description: English: Ukrainian Cossack private.
context_page_description: Registered Cossacks comprised special Cossack units of the Polish–Lithuanian Commonwealth army and of the Tsardom of Russia's army in the 16th and 17th centuries.
  Registered Cossacks became a military formation of the Commonwealth army beginning in 1572 soon after the Union of Lublin, 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.
context_section_description: Registered Cossacks (Ukrainian: Реєстрові козаки, Rejestrovi kozaky, Russian: Реестровые козаки, Rejestrovye kozaki,  Polish: Kozacy rejestrowi) comprised special Cossack units of the Polish–Lithuanian Commonwealth army and of the Tsardom of Russia's army in the 16th and 17th centuries.
  Registered Cossacks became a military formation of the Commonwealth army beginning in 1572 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.
caption: Registered Cossack's attire
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