In this paper the author examines the relationship between Louis of Anjou and the Slavonian nobility based on published historical sources and national and international literature. It is viewed from the aspect of the influence of Louis of Anjou’s reforms on identification and land- title changes as well as the mobility of the Slavonian nobility. Also, it analyzes King Louis’s centralist politics, which represent the king’s power and his aspiration to transform the kingdom into a territorial creation. At the beginning of the paper, the author gives an overview of Louis’s rule and presents his most significant economic, political and social reforms. Afterwards, the social and political structure of Slavonian nobility in the reign of Louis of Anjou is depicted, where three categories- high, middle and lesser nobility can be recognized. Furthermore, the author examines the relationship between nobility and King Louis regarding land ownership, where the king’s grants, new donations and the exchange of possessions are analyzed. This section emphasizes the Title of New Donation and explores the mobility, identification and land- title changes within the Slavonian nobility. Aftewards, certain members of the Slavonian nobility in the service of King Louis are presented, as well as their political and social roles and military careers. This paper is concluded by answering the research questions given in the introduction.