Question: What is the name of the Grand Duke of Lithuania, then the King of Poland, who reserved the rights of the overlord under the Pact of Vilnius and Radom?
{'answer': 'Władysław II Jagiełło', 'supporting_facts': [['Pact of Vilnius and Radom', 0], ['Pact of Vilnius and Radom', 2], ['Władysław II Jagiełło', 0]]}