The purpose of the final paper is based on an overview of the overall growth and development of written culture up to the 16th century, and the aim is to present a historical overview of Glagolitic incunabula. The origin of the alphabet, language, background for writing, the organization of the work of the printing workshop are the key elements of the way books are produced. The Gutenberg period began a gradual process of printing, an emphasis on the art and skill of typography, formats in printing, and printing marks. In addition to text, illuminations in manuscripts and printed books with initials, miniatures, etc. bring serenity and unite the elusive text of the incunabula. The beauty of the book of the written past is recognized in the old manuscripts and books, and their rarity is valued according to certain principles. Apart from Gutenberg, many contributed to the production of books, including Croatian printers and typographers, and rose to the high rank of European printing. In the early Middle Ages, monasteries were the only and central places of education, as well as the production and storage of books. In the 12th and 13th centuries, the growing motivation of the bourgeoisie for education was recognizable, which led to the opening of the first universities, which the Church and the state recognized as an independent institution. Such a period leads to increasing book production, falling its price and better availability. Numerous incunabula titles are printed in printing houses in Croatia, and three Croatian initials mark the specific value of Croatian culture. The peculiarity of Barović's breviary is manifested through the unusual technique of letters, respectively broken ligatures that do not last long due to their own precision. Through a unique analysis, this paper demonstrates the importance and appreciation of incunabula that are the beginnings of printed books.