Fall of the Serbian Empire

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.

Source: Wikipedia — Fall of the Serbian Empire (CC BY-SA 4.0)