Register of the Sumy regiment of 1663

The 1663 register of the Sumy Cossack Regiment reflects the administrative and territorial changes that took place in the regiment during that year. In particular, the register records the transfer of several burgher hundreds from Sumy to the Cossack estate in Vorozhba, as well as the optimization of the regimental management system. This document contains two lists of the Nizhnysyrovatska Hundred, which differ in personnel composition, and is an important source for researching changes in the administrative organization and social structure of the regiment.