The thesis tempts to brighten the views on the Thirty Years' War in the Holy Roman Empire of the German Nation that its contemporaries in the Duchy of Carniola had had. The land was never directly damaged by this war, even though this duchy belonged in the south of empire to a complex of Habsburg lands which enabled its own dynasty the engagement on the battlefields by paying the taxes. After the war had ended, the hereditary lands started to connect and alongside with the introduction of absolutism the Austrian state finally arose from the complex of Habsburg lands. Time before and during the war was in Carniola also significantly marked by the Counter-Reformation – this process had had a delay in the Habsburg territories in comparison to the lands in the centre of the empire – and introduction of absolutism which made an end to state-dynastic dualism. Progress of processes, Counter-Reformation as well as introduction of absolutism, depended on circumstances on European battlefields. Thus the Emperor Ferdinand II had taken advantage of victory over Denmark and imposed the edict of restitution on states of the empire, the renewed land constitution and absolutism on Czech lands and expulsion of protestant nobility in inner Austrian lands. Thesis presents Carniolan view on European events in the first half of 17th century based on four sources. In the first chapter the Thirty Years' War and the Duchy of Carniola are briefly presented. The second chapter handles with the view on the war that the College of Jesuits in Ljubljana had had. The source was the yearbook of Society of Jesus Historia annua. The third chapter examines the work of Ljubljana's prince bishop Tomaž Hren who led the Counter-Reformation in Carniola and was the inner Austrian governor at the time of the Thirty Years' War outburst. Description of his view on war is based on his calendar notes. This subject is also discussed in subchapter about the Sikst Carcano's apostolic visitation. Based on decrees of Carcano's visitation the course of Counter-Reformation in the hinterland of the Thirty Years' War is depicted. The last, fourth chapter treats the mentioning of Thirty Years' War in the work Die Ehre dess Hertzogthums Crain (1689) that was written by Janez Vajkard Valvasor and Erasmus Francisci. The curiosity of this work is the interconnection of catholic and protestant influences.