ENThis creative, intellectual and extremely gifted person was undoubtedly the exception to the estate of his. At the same time there are valid reasons for considering the Duke a representative of the aristocratic culture of the Grand Duchy of Lithuania - his exceptional musical intelligence, an eager predilection for playing music, the reflection upon the instances of musical culture as well as his patronage of music were settled by the traditions of the Grand Duchy’s period in Lithuania. The composer has developed beyond the habitual level of the musical interests of his environment in many respects, however, he never overstepped the limits of the music practice determined by the estate. All the fields of the Duke’s activities were influenced by his artistic nature, i. e., his diplomatic work and political duties as well as his literary, musical and historical creative works. The epistolary inheritance of the Duke is also of great abundance of examples of the manifestation of belles-letters. The preserved fragments from written sources characterise the Duke’s ethic and aesthetic views as well as shows him as a preromanticist with the closeness to classicism. At the same time the peculiarities of the changes of classicism and romanticism are revealed through his writings. It is obvious that the composer who created at the clash of the ages and the culture of classicism of the Grand Duchy of Lithuania were combined not merely by the traditions and the material heritage of the epoch. There were deeper and more important ties. The Duke’s flexibility of his attitudes, predetermined by his diplomatic habits, noble mannerism as well as by the spirit of the time did not object against his devotion to the principles of classicism. The composer in his utterances which were varied by the elements of literary mistifications only seldom would take a step into the direction of romantic world conception, still, he was the claimant of the ideology of enlightenment.His rational thinking, attention to the things of science, morals and self-education corresponded to the problems of educational ethics. Duke’s aesthetic views are also more closely related to classicism. His ideas about the creation of music, performer’s profession, aesthetical function of music, music instruments, means of expression in music tells us about his classicistic world outlook pertaining to romanticism only episodically. The Duke’s aesthetical principles of the creation of music are close to his words. Elated and romantic expression of the sense was absent to the composer as well as the exalted action was not accepted by him. The attitudes of dignitary culture of the Grand Duchy of Lithuania as well as the conservatism of the views of classicism suppressed the occurrences of romanticism in Duke’s world conception, and, thus, predeterminated the essence of his personality.