The article clarifies conceptual meaning of the classical terms of the ancient gromatic (urban planning) art — "cardo" and "decumanus". The issue of continuity of the Roman, Byzantine and Old Russian planning traditions is considered on the example of the city of Yaroslav’s layout in Kyiv. The planning value of the Golden Gate in Kyiv and Constantinople has been determined. The conclusion is made about the foundation of the city of Yaroslav after begining of the St. Sophia Cathedral construction. The development of the main planning axis of the city — cardo — is shown in the project of the classical reconstruction of Kyiv in the first half of the 19th and in 20th century. The problem of using traditional terms and concepts of ancient urban planning in modern research and urban planning practice is posed. In accordance with the clearly established boundaries of the ancient castrum on the territory of Kyiv Podol, the routes of its main streets can be clearly read. So the cardo (Via Praetoria) goes from north to south, approximately from the intersection of Mezhihirska and Yaroslavska streets (rear-guard gate, Porta Decumana), through the intersection of Kostyantynivska and Horiva Street (Pretoria), to the avant-garde gate (Rorta Praetoria) within the T-intersection of Frolivska Street with Borychiv Tik (one of the oldest streets in the city). From this place, the antique Podilska cardo in medieval times continued with Andriyivsky Uzvoz and the cardo of the new town of Yaroslav (1034), and at the beginning of the 19th century. within the limits of the classicist general plan of the city — along Volodymyrska Street to the south. In this way, we record the steady development of the urban planning tradition in Kyiv from the very beginning of the city's existence. Of course, one can question the legality of the application of the Roman- Byzantine urban planning concepts "cardo" and "decuman" in relation to the modern city. However, the planning structure of the central part of Kyiv within the boundaries of the Dnieper and Lybedi rivers did not develop all at once, but over the course of two thousand years of successive urban development, therefore the basic principles that determined the main features and directions of growth are critically important for understanding the urban design of the city to this day.
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