At the first half of 15th century, Serbian Orthodox bishops of Lipjan resided in Novo Brdo. There were mines and smelting furnaces for iron, lead, gold and silver ores. Novo Brdo silver is known by its glam silver (argentum de glama, an alloy of silver with 1/6-1/3 gold). In 1450 the mines of Novo Brdo were producing about 6,000 kg of silver per year. The medieval settlement was an important producer of Serbian pottery and other goods. Novo Brdo was the last Serbian town to remain standing during the first Ottoman invasion. In 1439 the capital of Smederevo fell and Serbia resisted until finally Novo Brdo fell in 1441. Novo Brdo was by treaty restored to the Serbs in 1443. The fortress (named in Turkish Nobırda) came under siege for forty days by the Ottomans, before capitulating and becoming occupied by the Ottomans on 1 June 1455. This event is described by Konstantin Mihailović from Ostrovica near Novo Brdo, who was taken by the Ottomans along with some 300 other boys to be trained as Janissaries. All of the higher ranking Serbian officials were executed after the castle fell, with the younger men and boys being taken captive to serve in the Ottoman Army, and some 700 young Serbian women and girls being taken to be wives to Ottoman commanders. When the city fell to the Ottomans, it had an estimated population of about 40,000 people. In the Ottoman Defter of 1591, the city of Novo Brdo itself was recorded within the Sanjak Vuçitern - this defter included the household heads of the city. The city consisted of several Muslim neighbourhoods (Mahalla/Mëhalla); they were Xhamia Sherif (Sherif Mosque, 26 households), Kasap (11 households), Hamam (21 households), Darbbane (40 households) and Mehmed Çelebi (5 households). There was also 6 Jewish households, including 1 that hailed from Catalonia and 1 that hailed from Castille. Of the Christian neighbourhoods (Mahalla/Mëhalla), the following had inhabitants of mixed Albanian-Slavic/Orthodox anthroponomy: Sokraja (15 households), Pop Simoni (12 households), Çarshi (13) and Himandin (9). Slavic/Orthodox anthroponomy predominated in the following neighbourhoods:Sveti Petra (19 households), Sveti Nika (9 households), Marko Kërsti (26 households), Filip (9 households), Pop Krilovina (10 households), Kallogjer Gligorija (6 households), Kovaç Radosavi (16 households), Shagliçiq (8 households), Shuster (14 households) and Vuka Mrkshiq (8 households). Characteristic Albanian anthroponomy predominated in the following neighbourhoods: Protopop (9 households), Izllatar (9 households), Pop Grobani (Grubani) (5 households),