The creation of the supreme court during the First Republic of Poland, which was the Crown Tribunal, was an important step in modernizing the system of justice. The introduction of the institution of appeal and other related institutions to the court procedure, enabling appeals against a judgment, was associated with a natural limitation of the monarch's prerogatives in such a state of affairs. The king as sovereign always issued a final judgment, from which no appeal was possible. The need to consider an appeal against a first instance decision necessitated the establishment of a supreme judicial authority. The Crown Tribunal has written a great page in the history of the Polish judiciary based on original and interesting legal and practical solutions. This study will present the genesis, functioning and influence of the Crown Tribunal on the development and functioning of the judiciary bodies of the Republic of Nobility in the period from the 16th to the 18th century