He left two daughters Maria and Jadwiga (the latter he destined for the throne of Hungary) under the guardianship of his widow, the daughter of the valiant ban of Bosnia, Stephen Kotromanic, whom he married in 1353, and who was in every way worthy of him.
He began his labours with The Age of Casimir the Great (1848), and Boleslaw the Brave (1849), following these with Jadwiga and Jagiello, in three volumes (1855-1856) - a work which Spasovich, in his Russian History of Slavonic Literature, compares in vigour of style and fullness of colour with Macaulay's History of England and Thierry's Norman Conquest.
By an agreement with the queen mother of Hungary at Kassa in 1383, the Poles finally accepted Jadwiga as their queen, and, on the 18th of February 1386, greatly against her will, the young princess, already betrothed to William of Austria, was wedded to Jagiello, grand duke of Lithuania, who had been crowned king of Poland at Cracow, three days previously, under the title of Wladislaus II.
See Jozef Ignacz Kraszewski, Lithuania under Witowt (Pol.) (Wilna, 1850); Augustin Theiner, Vetera Monumenta Poloniae (Rome, 1860-1864); Karol Szajnocha, Jadwiga and Jagiello (Pol.) (Lemberg, 1850-1856); Teodor Narbutt, History of the Lithuanian Nation (Pol.) (Wilna, 1835-1836); Codex epistolaris Witoldi Magni (ed.