Stefan Dečanski

Stefan Uroš III (c. 1276 – 11 November 1331), was King of Serbia from 6 January 1322 to 8 September 1331. Dečanski was the son of King Stefan Milutin (d. 1321). He defeated two other contenders to the Serbian throne. Stefan is known as Dečanski after the great monastery of Visoki Dečani he built.

Source: Wikipedia — https://en.wikipedia.org/wiki/Stefan_De%C4%8Danski