The purpose of the thesis is to analyse the law approach to duels in Czech law history and by analysis of selected legal texts to confirm the hypothesis that rather than idea of social development with ideas of humanity it is the fact that duel by its nature is competing with the law that determines the prevailing law approach to duels and the progress of this approach. This matter, the law approach to duels changing dynamically in history, is observed particularly from a law-giver point of view. The thesis consists of eight chapters, including introductory and ending part. The division into chapters is made chronologically with respect to prevailing law approach to duels (with the exception of the first and second chapter). In Introduction are briefly listed and evaluated works dealing with the abovementioned matter as well as introduction to the methodology used in the thesis. Chapter One examines meaning, origins and development of meaning of the word duel ("souboj" in Czech) and its equivalents. Chapter Two deals with origins of the duel. It is divided into two parts. Part One presents the main approaches in recent literature to the matter of duel origins. Part Two focuses on one of the most important sources of duel - a feud. Chapter Three is addressed to the duel as a part of legal...