Tvrtko II () deposed Stephen Ostojić in 1420, and the latter appears to have died in exile soon afterwards. In 1424 Tvrtko's position was briefly threatened by a relative named Vuk Banić, interpreted either as a grandson (through a daughter called Grubača) or as another illegitimate son of Tvrtko I. Another contender, from 1433 until 1435, was Ostoja's illegitimate son, Radivoj, who enjoyed the support of the Ottoman Empire. Despite these claimants, Tvrtko II considerably restored the royal dignity and strengthened Bosnian economy. In 1427 he settled the succession on the Hungarian nobleman Hermann II of Celje, son of Hermann I and Catherine of Bosnia, and the following year married the Hungarian noblewoman Dorothy Garai. Having reigned as king longer than any other Kotromanić, the widowed Tvrtko II died childless in 1443. He had outlived Hermann, whose son Frederick had no support in Bosnia; Tvrtko himself appears to have favored Ostoja's younger illegitimate son, Thomas, as his heir.