The Zaporozhian Cossacks, Zaporozhian Cossack Army, Zaporozhian Host, (, or ) or simply Zaporozhians () were Cossacks who lived beyond (that is, downstream from) the Dnieper Rapids. The Zaporozhian Sich grew rapidly in the 15th century from serfs fleeing the more controlled parts of the Polish–Lithuanian Commonwealth. It became established as a well-respected political entity with a parliamentary system of government. During the course of the 16th, 17th and well into the 18th century, the Zaporozhian Cossacks were a strong political and military force that challenged the authority of the Polish–Lithuanian Commonwealth, the Tsardom of Russia, and the Crimean Khanate. The host went through a series of conflicts and alliances involving the three powers, including supporting an uprising in the 18th century. Their leader signed a treaty with the Russians. This group was forcibly disbanded in the late 18th century by the Russian Empire, with much of the population relocated to the Kuban region on the south edge of the Russian Empire, while others founded cities in southern Ukraine and eventually became state peasants. The Cossacks served a valuable role of conquering the Caucasian tribes and in return enjoyed considerable freedom granted by the Tsars. The name comes from the location of their fortress, the Sich, in "land beyond the rapids", from Ukrainian "beyond" and "rapids". Origins It is not clear when the first Cossack communities on the Lower Dnieper began to form. There are signs and stories of similar people living in the Eurasian Steppe as early as the 12th century. At that time they were not called Cossacks, since cossack is a word that also in Turkic language means a "free man" which shares its etymology with the ethnic name "Kazakh". It later became a Ukrainian and Russian word for "freebooter." The steppes to the north of the Black Sea were inhabited by nomadic tribes such as the Cumans, Pechenegs and Khazars. The role of these tribes in the ethnogenesis of the Cossacks is disputed, although later Cossack sources claimed a Slavicised Khazar ancestry. There were also groups of people who fled into these wild steppes from the cultivated lands of Kyivan Rus' in order to escape oppression or criminal pursuit. Their lifestyle largely resembled that of the people now called Cossacks. They survived chiefly from hunting and fishing and raiding Asiatic tribes for horses and food, but they also mixed with these nomads as well adopting a