The subject of this Master's thesis, entitled The Importance of Atlagic Beys Lineage in the framework of the Sanjak of Klis, deals with the study of a Bey family’s history that was part of the Krajina elite of the Sanjaks of Klis and Krka, i.e. its significance and role within the frontiers of the Ottoman Empire. Therefore, the aim of this paper is to describe the history and to establish the significance of the Atlagic family within the Sanjaks with the permanent status of the Ottoman serhat. The very objective is to be attained by analytical observation, but also by the synthesis of available historical sources and previous portrayals of the mentioned family’s history. The research process draws on a previous, more detailed portrayal of the broader historical context within which the Atlagic family lived and acted. The content organization of this paper is thus divided into three chapters. In the first chapter, through a concise description, the author seeks to explain more clearly the process of expansion of Ottoman territory in the Balkans, as well as its basic features based on the characteristic military system and action and the leading Ottoman political doctrine called istimâlet politics. The focus of this description is on the Ottoman conquest of the Kingdom of Bosnia, whose end in 1463 created a new fulcrum for further Ottoman conquests on European soil and laid the foundation for the later organization of a new Ottoman province, beylerbey of Bosnia, which included the studied areas of the Sanjaks of Klis and Krka. Furthermore, the second chapter provides a more extensive portrayal of the various elements of the Ottoman system of government on the example of these twofrontier Sanjaks. In addition to the chronology of the occupation of the area on which they were established and the portrayal of smaller administrative and judicial districts that comprise the territory of the Sanjaks, the social structure of their population, military organization as well as economic conditions within the timar-sipahi system are also shown. In the last, and also the main chapter of the paper, after a brief overview of several prominent Bey families, i.e. the Krajina elite, the very subject of this thesis is elaborated, i.e. the history of the Atlagic family on the basis of existing historiographical portrayals and known historical sources, within the framework of the previously depictedfeatures of the Ottoman system and circumstances in the Sanjak of Klis and, related to it, the Sanjak of Krka.