The term Greater Serbia or Great Serbia describes the Serbian nationalist and irredentist ideology of the creation of a Serb state which would incorporate all regions of traditional significance to Serbs, a South Slavic ethnic group, including regions outside modern-day Serbia that are partly populated by Serbs. The initial movement's main ideology (Pan-Serbism) was to unite all Serbs into one state, claiming, depending on the version, different areas of many surrounding countries, regardless of non-Serb populations present.

Stefan Uroš IV Dušan, also known as Dušan the Mighty, was the king of Serbia from 8 September 1331 and tsar and autocrat of the Serbs, Greeks, Albanians and Bulgarians from 16 April 1346 until his death in 1355.