The
Pact of Vilnius and Radom (, ) was a set of three acts passed in
Vilnius,
Grand Duchy of Lithuania, and confirmed by the Crown Council in
Radom,
Kingdom of Poland in 1401. The union amended the earlier act of the
Union of Krewo (1385) and confirmed the
Ostrów Agreement (1392).
Vytautas, Grand Duke of Lithuania, became fully in charge of the Lithuanian affairs, while
Wladyslaw II Jagiello, King of Poland, reserved the rights of an overlord. After the death of Vytautas, Lithuania was to be ruled by Wladyslaw II Jagiello or his legal heir. The union is generally seen as strengthening of the
Polish–Lithuanian union.