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There were several other challengers to Andrew's claim to the throne. Rudolf I of Germany claimed that Hungary escheated to him after Ladislaus IV's childless death, because Ladislaus IV's grandfather, Béla IV of Hungary, had sworn fidelity to Frederick II, Holy Roman Emperor during the Mongol invasion of Hungary. Although Pope Innocent IV had years before freed Béla IV of his oath, Rudolf I of Germany attempted to bestow Hungary on his own son, Albert of Austria, on 31 August. The self-declared "Andrew, Duke of Slavonia"—an adventurer who claimed to be identical to Ladislaus IV's dead younger brother—also challenged King Andrew's right to the crown and stormed into Hungary from Poland. He was shortly thereafter forced to return to Poland, where he was murdered.