Immediately after the takeover of Belgrade, Stefan started the reconstruction of its fortifications, which were destroyed by the Ottomans in 1397. In addition, he began work on the development of the city, which were carried out by the end of his reign, but in the beginning of 1405, Stefan was transferred his capital to it, which until then was in Kruševac. In September of the same year, he married Helena Gattilusio, but only two months later, with his mother's death (11 November), Stefan remained without strong support. Nevertheless, the situation in Serbia have stabilized and start to grow in prosperity, as evidenced by the charter in Borač, 2 December of that year, issued from Dubrovnik. Negotiations about their shopping preferences are driven during the year and Despot with present Charter confirmed the privileges that they previously enjoyed. It also represents the charter of Serbian ruler, which was issued after the 1387th in Dubrovnik. At the end of the month, a charter was issued to them from Stefan's sister Mara Branković with sons. This includes Dubrovnik provide benefits to its merchants throughout Serbia, but it is noticeable that Stefan was not referred to the charter, even though her husband Vuk in their charters, always calling on those issued by Lazar of Prince Lazar.