Demetrius Suma (Albanian: Dhimitër Suma) was Albanian chieftain and baron who together with Vojvod Bogoe led a revolt with the nobles of Zeta against Tsar Stefan Dušan in April 1332[1][2][3] The revolt spread to the villages of the Buna river (Barbana) and to Prizren in 1334. Demetrius Suma was first mentioned in a letter to Stefan Dušan in 1332. The discovery was made by Baron Nopsca[4]. The revolt inspired Guillemus Adae (Albanian: Guljelmin e Adës), the archbishop of Bar (1324-1341) and author of Directorium,[5] to support the Catholic coalition of the Byzantine against Dusan[6]. The nobles of northern Albania refused to be subordinated under Dusans rule and quickly joined the revolt which was supported by the Papacy[7]. Tsar Stefan Dusan successfully suppressed the revolt in late 1332[8][9].

According to an article from Politiko the following can be read:
“Embracing Catholicism, in addition to drawing a clear demarcation line between Albanians and Serbs, had another great advantage. He built a bridge between the Albanians and the Catholic powers of Europe, incorporating their resistance into the powerful “Serbian” coalition that took shape, especially at the beginning of the century. XIV who saw the Pope, Hungary, the Anjouan’s of Naples, France engaged in the first person. Each of these powers had its own motives for clashing with the Nemanjic’s Serbia, in their case it was a matter of territories and areas of influence. However, since the antagonist was the same for everyone, Serbia, these interests were sometimes channeled into really large joint ventures, such as the crusade of 1319. The documents of the time best illustrate the role played by the Albanians in these joint military actions. In 1332, after witnessing a powerful “Serbian” uprising of the generous Albanian Dhimitër Suma, the French missionary Guljelm Adami sent to the king of France the project of a new “Serbian” crusade. It is interesting to note that the author of the project in question considers it sufficient to send to Albania, from France only a symbolic contingent. Albanians, according to him, were able to face action against Serbs on their own. It is interesting to note that the author of the project in question considers it sufficient to send to Albania, from France only a symbolic contingent. Albanians, according to him, were able to face action against Serbs on their own.

References

1. Problems of the Formation of the Albanian People, Their Language, and Culture: (selection). “8 Nëntori” Publishing House. 1984. p. 222.
2. Lala, Etleva (2008). Regnum Albaniae, the Papal Curia, and the Western Visions of a Borderline Nobility (PDF) (Supervisor: Professor Gerhard Jaritz ed.). Budapest, Hungary: Central European University Department of Medieval Studie. p. 113. Retrieved 5 August 2019.
3. 14 April 1332: Acta Albaniae I, no. 759.
4. Elsie, Robert (2015). The Tribes of Albania: History, Society and Culture. I.B.Tauris. p. 108. ISBN 9781784534011.
5. Jireek, Geschichte der Serben I, 371.
6. Historia e popullit shqiptar (in Albanian). Botimet Toena. 2002. p. 279.
7. Prifti, Kristaq (1993). The Truth on Kosova. Encyclopaedia Publishing House. p. 51.
8. Magill, Frank Northen; Aves, Alison (1998). Dictionary of World Biography: The Middle Ages. Routledge. p. 843. ISBN 9781579580414.
9. Fine, John V. A.; Fine, John Van Antwerp (1994). The Late Medieval Balkans: A Critical Survey from the Late Twelfth Century to the Ottoman Conquest. University of Michigan Press. p. 275. ISBN 9780472082605.
10. https://memorie.al/en/our-ancestors-who-were-diplomats-doctors-merchants-etc-were-related-to-the-pope-while-demetrius-who-was-a-baron-defeated-stefan-dushan-and-the-unknown-history-of-the-famous-shkodra-fa/
11. https://politiko.al/english/print/persekucioni-dhe-konvertimi-serb-ne-mesjete-ne-kohen-e-mbreterise-se-neman-i461652