The article is devoted to the consideration of several aspects of the social history of the Little Russian nobility of the XIX century. On the basis of archival documents, which are introduced into circulation for the first time, the author traces the complex process of nobilitation of the descendants of the Cossack-sergeant family to the general imperial nobility on the example of the noble Panchenko family from the city of Nizhyn. Comparing these processes on the Left Bank and on the lands of the Right Bank of Ukraine, the author reveals common features and regional differences. Having studied and analyzed genealogical, heraldic, sphragistic sources, the researcher draws attention to the difficulties encountered by the descendants of Cossack families in proving their «noble origin». On the example of the Panchenko family, we can state that this process lasted for almost two decades, and if we take into account how many years the family representative Ivan Ivanovich Panchenko served to get «starting opportunities» to start the process of proving his nobility, we should talk about a lifetime. Descendant of the famous Cossack family, father, grandfather, great-grandfather, who served in the Zaporozhian Army, went on campaigns with Bohdan Khmelnytsky, Ivan Samoilovich forced by all, even sometimes not quite legal ways, to prove their origin. The desire to be part of the noble nobility and take over for themselves and their families the privileges inherent in the nobility, sometimes push the seekers to outright deception. The analysis of archival documents allows not only to trace the life and career path of an «ordinary person from the province of Little Russia», but also to identify and evaluate his worldview and values, to look at the family-intimate and domestic side of life in a few centuries.