Stefan Konstantin was the King of Serbia in c. 1321–22. The younger son of King Stefan Milutin, he initially held the appanage of Zeta, and was the heir to the Serbian throne after his father had exiled his elder brother Stefan Uroš. After his father's death, a throne struggle broke out between Konstantin, Stefan Uroš and their cousin Vladislav II. He was killed by his younger brother in c. 1322, who went on to defeat Vladislav and gained the Serbian throne, as Stefan Uroš III.
After the failed rebellion by his younger brother Stefan Uroš III, and the death of his uncle Stefan Dragutin in 1316, Konstantin was allegedly given the title Young King, and ruled Zeta; as de facto intended heir, though his father had not officially proclaimed him as such in the state assembly. Stefan Uroš III had been exiled to Constantinople, but had been allowed to return in 1321 following talks between the Archbishop and King Milutin. His father's endowment of the cathedral of Bari included a silver altar with Konstantin's inscribed name.
King
His father died on 29 October 1321. Konstantin was proclaimed King in Zeta, and started to issue coins from Skadar, which depicted him sitting on a throne, including a Latin inscription. Venetian chronicles mention him as "king" ; if Konstantin indeed signed his coinage in Skadar with that title, it shows which plans he had. At the same time, his brother Stefan Uroš III and cousin Vladislav, Dragutin's son, claimed the throne. Details of the throne struggle does not exist, though it is known it resulted in an armed conflict. The Church supported Uroš III, and on 6 January 1322, crowned him King ofSerbia, after which, according to the hagiography by Grigorije Camblak, Konstantin was offered to "accept another dignified Empire, as the second son". He declined, as he trusted the strength of his army, in which there were also foreign mercenaries. Konstantin's army was defeated, and part of the troops switched to Uroš III's side. Konstantin was most likely captured or killed while retreating. Uroš III went on to defeat Vladislav, the ruler of the Kingdom of Syrmia, in late 1324; and unified the Serbian crown. According to A. Ivić, he was anti-king sometime between 1321 and 1323, when he was killed. According to Serbian epic poetry, Konstantin was supported by the Bulgarians; Vladislav was a Hungarian candidate; and Stefan Uroš III was supported by the Byzantines. Uroš III bribed Konstantin's army, which crucified him, sawed him in half, and tossed him into the river. Some chronicles have recorded stories of his alleged brutal execution, with the Dominican Pseudo-Brocard stated that Uroš III ordered him nailed to a tree, after which he was cut in half, while Mavro Orbin said that this was done by Vladislav, who had captured him. There also exist a legend that his severed head was emptied and used as a cup from which Uroš III drank wine.
Legacy
Konstantine provided long lists of Byzantine, Bulgarian and Serbian monarchs from the 11th century onwards, as his father had done before him. After Konstantin's death, his body was transferred and buried in the Church of St. Nicholas, Zvečan, in Kosovo, an endowment of the Nemanjić dynasty. According to Vasojevići folklore, the tribe was founded by Vaso, great-grandson of Stefan Konstantin. The Vasojevići tribe, and Vaso, the founder, is mentioned for the first time in a document found in an archive of Dubrovnik, dated 1444.
