The article analyzes the formation and development of the Galicia-Volyn State – the legal successor of the Kyiv-Rus state (XII – first half of the XIV century). It is shown that the GaliciaVolyn State was the largest and most powerful among the specific principalities that emerged on Ukrainian lands as a result of the collapse of Kyiv-Rus state. The creation of the Galicia-Volyn State is an important stage in the history of Ukrainian statehood. This state achieved significant political development and in terms of economy and culture was included in the list of the most advanced countries of Europe at that time. 
It is noted that the Galicia-Volyn State occupies an important place in the history of Ukrainian statehood, as it covered in the XIII century. up to 90 % of Ukrainian territory, preserved Ukrainian culture, language, and traditions. As the heir to the Kyivan state, which had fallen, it opened the door to Western European cultural influence on Ukraine, while preserving the best traditions of Ukrainian culture. The favorable geographical location of the Galicia-Volyn state, primarily its proximity to Western European trade routes, led to its economic growth and strengthening. The active and energetic unification policy of the Galician-Volyn princes Roman Mstislavovych and Danylo Romanovych contributed to the political rise of the state, transforming it into an active participant in the international arena. For more than a hundred years, the position of the GalicianVolyn state significantly influenced the political processes of Western Europe of that time, and its rulers were among the most prominent figures in European politics. Thanks to intensive relations with Europe, it was possible to significantly spread Western European culture, avoiding a one-sided orientation towards Byzantium. Events in the Galician-Volyn state were reflected in the chronicles of Western states. During the second half of the 13th – first half of the 14th century. The Galicia-Volyn state reached a high level of political development. It united ethnographically Ukrainian lands, the Ukrainian population, and because of this, Ukrainian national features were much stronger in its socio-political development. Its legal system was based mainly on sources not of foreign, but of Rus law, on local legislation and customs. 
With the fall of the Galicia-Volyn state, an important period of the formation of the early statehood of the Ukrainian people, which began at the end of the 7th century. and continued until the middle of the 14th century, ended. This period had three stages: the era of the State of the Ants, the era of the Kyiv-Rus state, and the era of the Galicia-Volyn state, which was a direct continuation, without a historical break, of the state traditions of the Ukrainians, their own political and legal culture, and autochthonous law. The significance of the Kyiv-Rus state and its successor and successor, the Galician-Volyn state, lies primarily in the unification of Ukrainian tribes on the territory of modern ethnic Ukrainian lands into a single state, which made it possible to effectively defend themselves from the attacks of nomads and neighboring states. During this period, the foundations, the foundation of the socio-economic, political and cultural development of the proto Ukrainians were laid. The special mission of the Kyiv-Rus state and its successor, the Galician-Volyn state, is defined as the protection of Western European states from the nomadic hordes of Turkic tribes, especially the Mongol invasion. These early Ukrainian states were active participants in the international relations of that time, as evidenced by the extensive dynastic marriages, especially under Yaroslav the Wise, who was called the “father-in-law of Europe”, as well as the broad cultural relations of the Kyiv-Rus state, and then the Galician-Volyn state, with a number of European states. The manifestation of the international authority of the Galician-Volyn state was the coronation of the ruler of the Galician-Volyn state, Danylo, which testifies to the European orientation of the foreign policy of this state.
 An invaluable asset of the Kyiv-Rus state and its successor, the Galician-Volyn state, was the law, profound in content and original in form, which had a humane character, as well as many common features with the law of European peoples. It was in the Galician-Volyn principality that both traditions of the reception of Roman law took shape – both eastern (through Byzantine (Eastern Roman) law and canon law) and western (through Magdeburg law), which was later traced in the legal system operating in Western Ukrainian lands both in the Lithuanian-Polish era and during the Habsburg monarchy. The Galicia-Volyn state established the foundations of Ukrainian statehood, accumulated strength for its further development. Its political, economic, military, cultural and state-legal traditions had a significant impact on the development of Ukrainian statehood in subsequent periods.
 

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