The fall of the Serbian Empire was a decades-long period in the late 14th century that marked the end of the once-powerful Serbian Empire. This period is known as the dissolution or the beginning of the fall of the Serbian Empire, between 1366 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 against the invading Ottoman Empire, and southern Serbian provinces became nominal Ottoman vassals. The lords could not agree on the ruler, they dismissed Prince Marko, the son of Vukašin. The period after the death of Uroš and Vukašin was marked with the rise and fall of Prince Lazar, Lazar ruled the most powerful Serbian principality – Moravian Serbia. The rule of Lazar ended with his death in the Battle of Kosovo in 1389, when Serbia stood up against invading Ottomans, an event that is deeply rooted in Serbdom. After the battle, and by 1395, most of the provinces were conquered and annexed by the Ottomans. Dušans half brother Simeon Uroš was expelled from Epirus and sought to obtain Serbia and he marched on Serbia in 1357 after he had himself proclaimed Tsar of the Greeks, Serbs, and Albanians at Kastoria in 1356. The forces of Stephen Uroš met the forces of Simeon near Scutari in Zeta, the ransom was paid by the Emperor John V Palaiologos and Matthew was allowed to retire to Morea. Now the lands that remained loyal to Uroš were most of Macedonia, the lands that remained Serbian could be divided into three main parts, the western territories, including Zeta, the central Serbian lands of Uroš and the southern lands. One of the strongest western nobles was Vojislav Vojinović and he quarreled with the Republic of Ragusa in the fall of 1358, when the Serbs, the Hungarians penetrated deep into Serbian territory and the Serbian army retreated to avoid battle with the attackers. Vojislav waited until the Hungarians withdrew in 1359 then he attacked Ragusa, in 1363 the Hungarians and Wallachians were joined by Bosnian and Serbian forces committed to expel the Ottoman Turks from Europe. Caught by surprise near Adrianople, these forces were defeated by the Turks in 1364 on the banks of the Maritsa river, in 1365 Vukašin was proclaimed King of Serbia and co-ruler with Uroš, and Jovan Uglješa was made Despot in the Serbian principality of Serres. There was a far more serious problem for Serbia — and the whole Balkans — than the internal squabbling of the Serbian nobles, followed by their penetration into Thrace, in 1354 they acquired Gallipoli on the European side of the Dardanelles. From there, they expanded into Thrace taking Demotika from the Byzantines in 1361 and Philippopolis from the Bulgarians in 1363, by 1370 Turks had occupied most of Thrace to the Rhodopes and to the Balkan Mountains. As they reached the Rhodopes they collided with Jovan Uglješa who had extended his realm beyond the Mesta into this territory, the offensive against the Turks was originally scheduled for early 1371, but was delayed perhaps because Uglješa had hoped that Bulgaria might also join the coalition. Furthermore, they did not keep their horses or their weapons in readiness, the Ottomans won the battle, as they attacked the Serbian army while they rested. The bodies of the commanders were not found, Prince Marko inherited the royal title of his father, and became the co-ruler of Emperor Uroš
Internal divisions of the Serbian Empire around 1360
Destruction of the Serbian Empire on Kosovo.
States in the Central Balkans that emerged after the dissolution of the Serbian Empire in the 14th century (1373–1395)