Deaths on June 3

Leopold IV, Duke of Austria (b. 1371)

Leopold IV of Austria (1371 – June 3, 1411), Duke of Further Austria, was an Austrian Habsburg Duke of the Leopoldinian Line, known as "the Fat".

17 Feb

Mircea I of Wallachia
Following the successful campaigns during the Ottoman Interregnum, Musa Çelebi, one of the sons of Bayezid I, becomes Sultan with the support of Mircea I of Wallachia.
6 Jul

Ming-Kotte War
Ming China's Admiral Zheng He returns to Nanjing after the third treasure voyage and presents the Sinhalese king, captured during the Ming-Kotte War, to the Yongle Emperor.