Stephen II died in September 1353. His brother Vladislav was excluded from the succession for reasons unknown, and Stephen was succeeded directly by Tvrtko I, Vladislav's son by Jelena Šubić. Tvrtko initially lost a significant part of his patrimony to Louis, supposedly promised as Elizabeth's dowry, and was briefly deposed in 1365-66 in favour of his younger brother, Vuk. Upon restoration, however, Tvrtko's power steadily increased. He conquered some remnants of the Serbian Empire and, citing his descent from Serbia's extinct Nemanjić dynasty through his grandmother Elizabeth, had himself crowned king in 1377. He then proceeded to conquer large parts of Slavonia, Dalmatia and Croatia proper. Having established Bosnia as a kingdom and brought it to its largest extent in history, Tvrtko called himself "by the Grace of God King of Rascia, Bosnia, Dalmatia, Croatia, and Pomorje". After the death of his first wife, Dorothea of Bulgaria, Tvrtko was negotiating a marital alliance into the rising Austrian Habsburg family, but the plan never materialized due to his death on 10 March 1391.