This article recalls the personality of the Civil Law scholar, Roman law scholar and politician Robert Mayr-Harting, who was born 150 years ago in 2024. An Austrian German, Mayr-Harting spent his childhood and youth in Vienna, where he also graduated from the Faculty of Law. His first university career took him to the provincial university in Czernowitz, but later he was called to the Faculty of Law of the German Charles-Ferdinand University in Prague, where he remained due to circumstances for many decades. From the beginning, he combined an interest in Roman law with an interest in modern Civil law, and later, after the First World War, this interest completely prevailed. The political change of 1918 brought about the removal of political ties of Germans in the Czech Lands to the headquarters of the political parties in Vienna, opened the way to the political path for some new faces, and among them was also Mayr-Harting, active in the German Christian Social Party, for which he was in the National Assembly in years 1920–1939. As a politician, he understood the disadvantage of the negativist policy towards Czechoslovakia and tried to promote a policy of activism. This culminated in the entry of German ministers into the government in 1926. Mayr-Harting fought the struggle for the activist direction of his own political party in the 1920s and again in the 1930s. Despite his political activity, the scholar left a professional work of considerable importance, consisting of Civil law and Roman law monographs and articles, and also of the comprehensive textbook of Civil law.