Yotvingia was a Prussian region, then subordinate to Kievan Rus (since 983), that intersected the borders of what was then Prussia, Kievan Rus and the Duchy of Lithuania.
Because of that, the town was disputed by both the Kingdom of Poland, Duchy of Mazovia and the Duchy of Lithuania, with the latter state briefly gaining the upper hand.
In the early years of Polish statehood Radzyń was located in extreme northeastern corner of Lesser Poland, near the border with Rus and the Duchy of Lithuania.
Historical records show that the settlement emerged as a fortified border crossing of the Duchy of Lithuania.
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Eustachy Tyszkiewicz (1814–1874), Polish–Lithuanian noble, archaeologist and historian from the former Grand Duchy of Lithuania
Samuel Kmicic - a nobleman (szlachcic) from Grand Duchy of Lithuania in the Polish-Lithuanian Commonwealth
By 1569, when the regions of Podlaskie, Volhynia, Podolia and the Kiev were separated from Grand Duchy of Lithuania, and incorporated into Kingdom of Poland, the books which concerned these regions, were removed from the Lithuanian Metrica, and merged into the Polish Metrica.
Ruthenian language, varieties of Eastern Slavonic spoken in the Grand Duchy of Lithuania
Pogoń, a Knight-in-pursuit coat of arms of the Grand Duchy of Lithuania
Duchy of Livonia, a dominion of the Grand Duchy of Lithuania and later the Polish-Lithuanian Commonwealth