In the Roman period, "Moesia" was the name for a region that included Serbia proper. Viminacium (present-day Kostolac) was the capital of the province of Moesia Superior. Slavs ("Sclaveni") overwhelmed the Balkans in the 6th and 7th centuries. The Serbs, a Slavic tribe, were known to have held the area of what is today southwest Serbia in the Early Middle Ages, while the "Royal Frankish Annals" mention the Braničevci and Timočani, in the eastern parts, in the 9th century. Raška, situated in the southwest, was the core of the medieval Serbian state; Stari Ras has been identified as a capital of the Grand Principality of Serbia. Serbia eventually expanded its borders to the east. The area of most of Serbia proper, as well as areas in eastern Bosnia and Herzegovina, northern Montenegro, Kosovo, and northern Macedonia were called "the Serbian lands", included in the styles of medieval Serbian rulers. King Stefan Dragutin of Syrmia (r. 1282–1316) had two capitals, Debrc and Belgrade. After the fall of the Serbian Empire, the "Moravian Serbia" under Lazar (r. 1373–89) and Stefan Lazarević (r. 1389–1402) corresponded roughly to Serbia proper. Kruševac was the capital of Moravian Serbia, until the Ottoman conquests in the 15th century, and the establishment of the Serbian Despotate, with the capital in Belgrade. After the Ottoman conquest of the Serbian Despotate, the Sanjak of Smederevo was established, initially seated in Smederevo, and eventually, in Belgrade after its fall in 1521 (hence called the "Pashaluk of Belgrade").