Moravian Serbia attained its full extent in 1379, when Lazar took Braničevo and Kučevo, ousting the Hungarian vassal Radič Branković Rastislalić from these regions. Lazar's state was larger than the domains of the other lords on the territory of the former Serbian Empire. It also had a better organized government and army. The state comprised the basins of the Great Morava, West Morava, and South Morava Rivers, extending from the source of South Morava northward to the Danube and Sava Rivers. Its north-western border ran along the Drina River. Besides the capital Kruševac, the state included important towns of Niš and Užice, as well as Novo Brdo and Rudnik, two richest mining centres of medieval Serbia. Of all the Serbian lands, Lazar's state lay furthest from Ottoman centres, and was least exposed to the ravages of Turkish raiding parties. This circumstance attracted immigrants from Turkish-threatened areas, who built new villages and hamlets in previously poorly inhabited and uncultivated areas of Moravian Serbia. There were also spiritual persons among the immigrants, which stimulated the revival of old ecclesiastical centres and the foundation of new ones in Lazar's state.