Serbian lands were thus divided between the regional lords: King Marko, son of King Vukašin of Serbia, claimed the royal title and seized southwestern regions, while the Dejanović brothers, nieces of the late Emperor Stefan Dušan, ruled the southeastern provinces. Other lords were: Đurađ I Balšić, Vuk Branković, Nikola Altomanović, and Lazar Hrebeljanović. Lazar managed to rule most of what is today Central Serbia (known as Moravian Serbia). He was unable to unite the Serbian magnates, as they were too powerful and pursued their own interests, fighting each other. On the other side, Tvrtko I of Bosnia annexed several western regions, and claimed, since he was descended through his paternal grandmother from the Nemanjić dynasty, that he was the rightful hair to Serbian throne. In 1377, he came to his newly acquired provinces in western Serbia and was crowned in Mileševa Monastery as King of the Serbs and Bosnia.