The Cossacks are a predominantly East Slavic Orthodox Christian people originating in the Pontic–Caspian steppe of eastern Ukraine and southern Russia. Historically, they were a semi-nomadic and semi-militarized people, who, while under the nominal suzerainty of various Eastern European states at the time, were allowed a great degree of self-governance in exchange for military service. Although numerous linguistic and religious groups came together to form the Cossacks, most of them coalesced and became East Slavic-speaking Orthodox Christians.

Don Cossacks or Donians, are Cossacks who settled along the middle and lower Don. Historically, they lived within the former Don Cossack Host, which was either an independent or an autonomous democratic republic in present-day Southern Russia and parts of the Donbas region of Ukraine, from the end of the 16th century until 1918. As of 1992, by presidential decree of the Russian Federation, Cossacks can be enrolled on a special register. A number of Cossack communities have been reconstituted to further Cossack cultural traditions, including those of the Don Cossack Host. Don Cossacks have had a rich military tradition - they played an important part in the historical development of the Russian Empire and participated in most of its major wars.