- 1 - Abstract: Zawisza Czarny of Garbów was not only among elite warriors and tournament fighters but also among prominent and respected diplomats of his time. His versatile services were used by two significant Central European rulers - Vladislav II Jagiellon and Sigismund of Luxembourg. The aim of this thesis is to explain and characterize the activities of Zawisza of Garbów alongside Sigismund of Luxembourg, a topic that historiography has only addressed in a general manner. The starting point is the results of previous research. The thesis focuses on the study of sources, especially narrative and documentary ones, as well as their analysis and comparison. Individual episodes from the life of Zawisza of Garbów associated with Sigismund of Luxembourg are placed within the broader context of the political developments in the countries of Central Europe, particularly the Kingdoms of Poland and Hungary, their mutual relations, and the political activities of King Sigismund of Luxembourg. Another aspect of the thesis is dedicated to contemporary social phenomena, such as the phenomenon of chivalry. Last but not least, the thesis attempts to answer the question of the mutual relationship between the ruler and his prominent knight and its reflection in later tradition. ; - 1 - Abstrakt Záviš Čierny z Garbowa patril nielen medzi elitných bojovníkov a turnajových zápasníkov, ale aj medzi popredných a vážených dobových diplomatov. Jeho všestranné služby využívali dvaja významní stredoeurópski panovníci - Vladislav II. Jagelo a Žigmund Luxembursky. Cieľom tejto práce je spracovať a charakterizovať pôsobenie Záviša z Gaborwa po boku Žigmunda Luxemburského, čomu sa historiografia doteraz venovala len rámcovo. Východiskom sú výsledky doterajšieho bádania. Práca sa sústreďuje na štúdium prameňov, najmä naračného a listinného charakteru, a ich analýze a komparácii. Jednotlivé epizódy zo života Záviša z Garbowa spojené so Žigmundom Luxemburským sú kladené do širšieho kontextu politického vývoja krajín strednej Európy, ...