Does anyone have any information regarding the earliest formation of the cossack bands?
So far I have found information that the cossacks had started forming after the fall of the Kievan Rus when parts of the population moved to the safer steppes by the Dnieper river. This forming was then stunted by the Mongol invasion. The first mention of the word 'kazak' was in a ruthenian chronicle from 1395. I also know that the number of cossacks grew at a very high rate between the XVth and XVIIth century due to the number serfs running from their master's estates in the Polish-Lithuanian Commonwealth and joining them. This is when the cossacks started making their name known in the world and there are more and more sources about them from the XVIth century onwards culminating with Bogdan Hmelnitki's rebellion.
My question is: were there any cossack bands in the southern part of Ukraine during the Tsardoms timeframe?