"On the Buildings of Justinian" is a book published almost 1500 years ago, written by the Byzantine historian Procopius. In his work, he describes in detail the architectural masterpieces of the reign of Emperor Justinian, including Hagia Sophia in Constantinople, the Triumphal Arch and other notable buildings. The book is an important source for the study of Byzantine art and architecture of the period. Procopius not only describes the buildings, but also tries to reveal their historical and cultural context, telling the reader about the importance of these structures for the imperial power and for the lives of the city dwellers. The book helps to better understand the exploits of Justinian himself and the role he played in the development of Byzantium.