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The 'Union of Vilnius and Radom' was a set of acts passed in 1401 in Vilnius, Lithuania, and confirmed by the Crown Council in Radom later the same year. The union amended the earlier act of the Krewo Union and granted the Grand Duchy of Lithuania vast internal autonomy. Vytautas the Great was instituted as the Grand Duke of Lithuania while his cousin Jogaila retained the rights of an overlord.