Stefan Konstantin was the King of Serbia from 29 October 1321 to the spring of 1322. The younger son of King Stefan Milutin (1253–1321), he initially held the appanage of Zeta, and was the heir to the Serbian throne after his father had exiled his elder brother Stefan. After his father's death, a throne struggle broke out between Konstantin, Stefan and their cousin Vladislav II, evolving into the two years long civil war. He was killed in the battle fighting his brother, who went on to defeat Vladislav, too, and gained the Serbian throne as Stefan Uroš III, better known as Stefan Dečanski.

The Kingdom of Serbia, or the Serbian Kingdom, was a medieval Serbian state that existed from 1217 to 1346 and was ruled by the Nemanjić dynasty. The Grand Principality of Serbia was elevated with the regal coronation of Stefan Nemanjić as king, after the reunification of Serbian lands. In 1219, Serbian Orthodox Church was reorganized as an autocephalous archbishopric, headed by Saint Sava. The kingdom was proclaimed an empire in 1346, but kingship was not abolished as an institution, since the title of a king was used as an official designation for a co-ruler of the emperor.