Medieval Serbian nobility in the context of "Serbian nobility"

The fall of the Serbian Empire was a decades-long process in the late 14th century. Following the death of the childless Emperor Stefan Uroš V in 1371, the Serbian Empire was left without an heir and the magnates, velikaši, obtained the rule of its provinces and districts (in so-called feudal fragmentation), continuing their offices as independent with titles such as gospodin, and despot, given to them during the Empire. This period is known as the dissolution or the beginning of the fall of the Serbian Empire.

Between 1365 and 1371, King Vukašin was the co-ruler of Emperor Uroš, ruling the southern half, thus the Empire may be viewed as a de facto diarchy. Before 1371, the nobility were either directly subordinate to Emperor Uroš or to Vukašin. Vukašin died in the Battle of Maritsa (1371) against the invading Ottoman Empire, and southern Serbian provinces became nominal Ottoman vassals. Four months later, Uroš died. The lords could not agree on the rightful ruler; they dismissed Prince Marko, the son of Vukašin, and conflicts started between the nobles within a year. An assembly was held in 1374 without any success since the nobles were unable to agree on whether Marko or Prince Lazar would head the Serbian confederation as the Serbian king and the state continued as before, fragmented and without central authority.

The Battle of Maritsa, also known as the Battle of Chernomen (Serbian: Marička bitka / Маричка битка; Turkish: Çirmen Muharebesi, İkinci Meriç Muharebesi; "Second Battle of Maritsa"), was fought on 26 September 1371 near the Maritsa River, close to the village of Chernomen (present-day Ormenio, Greece). The conflict pitted the Ottoman forces under Lala Şahin Pasha and Hacı İlbey against a coalition of Serbian lords, led by King Vukašin Mrnjavčević and his brother Despot Jovan Uglješa who sought to halt the Ottomans' westward advance. The battle ended in a decisive Ottoman victory in which both Serbian commanders were killed, marking the decline of Serbian power in Macedonia and paving the way for Ottoman expansion into the central Balkans.

Jovan Uglješa (Serbian Cyrillic: Јован Угљеша; fl. 1346–1371) was a Serbian medieval nobleman of the Mrnjavčević family and one of the most prominent magnates of the Serbian Empire. He held the title of despot, received from Serbian Emperor Stefan Uroš V, whose co-ruler - Serbian King Vukašin was Uglješa's brother.

Uglješa was the son of Mrnjava, a treasurer of Helen, the queen consort of Stephen Uroš I of Serbia. He held Travunija in 1346, during the rule of Stefan Dušan (1331–1355). Uglješa married Jelena (later nun Jefimija), daughter of Vojihna, the kesar of Drama. This boosted the power of Uglješa, who would later govern the region alongside his father-in-law. Vojihna died in 1360, and his lands were inherited by Uglješa. He was given the title of despotes by the widowed Serbian empress, Helena of Bulgaria, in 1365. His domain, the Principality of Serres [bg], was situated along the lower course of the Struma with Serres as seat, eventually replacing Helena in its possession. From 1368, his territory was under the religious jurisdiction of the Ecumenical Patriarchate of Constantinople. The Patriarch mentioned the "master of Raška" (another name for Serbia), Jovan Uglješa, in a letter from 1371. With the Ottoman threat rising in the Balkans, Uglješa and his brothers Vukašin Mrnjavčević and Gojko Mrnjavčević tried to oppose the Turks. Uglješa was killed on 26 September 1371 in the Battle of Maritsa. Their troops were defeated by those of Ottoman commanders Lala Shahin Pasha and Gazi Evrenos at the Battle of Maritsa in 1371. The defeat resulted in large portions of the region of Macedonia falling under Ottoman power. Additionally, Uglješa's two brothers were killed during the fight. Their courage made them heroes of Bulgarian and Serbian epic poetry.