LTReikšminiai žodžiai: Horodlės unija; Lenkijos karalius Jogaila; Lietuvos didysis kunigaikštis Vytautas; Didikai; Bajorai; Herbinė adopcija. Keywords: Union of Horodlo; King Wladyslaw II Jagiello of Poland; Grand Duke Vytautas of Lithuania; Grandee; Noblemen; Heraldic adoption.Reikšminiai žodžiai: 15 amžius; Lietuvos Didžioji Kunigaikštystė (LDK; Grand Duchy of Lithuania; GDL); Lenkija (Lenkijos karalystė. Kingdom of Poland. Poland); Horodlės unija (Union of Horodlo); Kilmingieji; Bajorai; Antspaudai; Istoriografija; Nobility; Boyars; Heraldic adoption; Historiography; 15th century.
ENThe article analyses achievements of contemporary historiography in the study of the role and significance of the Gorodel Union of 1413 in the formation of the gentry class of the Grand Duchy of Lithuania. The key subjects of scientific research of Polish, Lithuanian, Belarusian, Ukrainian and Russian historians are identified. It is emphasised that these subjects, as a rule, are not an independent historiographical problem and act as part of a broader research discussion about the causes and results of the Union of 1413 in the system of relations between the Grand Duchy of Lithuania and the Kingdom of Poland. In conclusion, it is noted that despite the differences in the interpretation of a number of specific issues, researchers generally agree in the statement that the acts of the Gorodel Union and the heraldic adoption, both in their content and in their consequences, are one of the key stages in the process of forming the nobility of the Grand Duchy of Lithuania. [From the publication]