Eucologio Kyiviano della Biblioteca Apostolica Vaticana, 15 del fondo Borgio-Illirico rimane uno dei più importanti codici slavi che rappresenta la vita liturgica della Chiesa della Rus’ di Kyiv (XV-XVI sec.)

The article examines the history of the manuscript of the Kiev Euchologion (15th-16th century) located in the Vatican Apostolic Library (collection Borgio-Illirico No. 15). The places are given where this manuscript has survived, and how it has been used over the centuries. A historiographic analysis of previous studies was made and the descriptions of the manuscript that were made in earlier scientific studies were presented. In addition, paleographic and codicological aspects of this manuscript were given, and its uniqueness as well as its importance as one of the important sources for the history, language and culture of the Ukrainian nation were indicated and confirmed.