Grubeša Branislavljević (died 1125) was the prince and ruler of Duklja

Duklja

Doclea or Duklja was a medieval state with hereditary lands roughly encompassing the territories of present-day southeastern Montenegro, from Kotor on the west to the river Bojana on the east and to the sources of Zeta and Morača rivers on the north....

 and Bar

Bar, Montenegro

Bar is a coastal town in Montenegro. It has a population of 17,727...

 from 1118 to 1125. After the Byzantines defeated King George

George of Duklja

George was a King of Duklja in 1113–1118 and again from 1125 to 1131.With his mother, Jaquinta, he opposed the rule of his cousin, Vladimir, and Raškan influence on Duklja. Jaquinta and George had Vladimir fatally poisoned in 1118 and George was crowned king that same year...

 in 1118, Grubeša assumed the Doclean throne as a Byzantine protégé. The Byzantines entitled Grubeša the rule in Duklja, as well as an army that he would command against George. Grubeša reigned until his death in 1125, when he was defeated in Bar by George, who was backed by the Serbian Grand Principality

Serbian Grand Principality

The Serbian Grand Principality or Rascia was a medieval state that was founded in 1090, and ended with the elevation to Kingdom in 1217. During the reign of Constantine Bodin, the King of Duklja, Vukan was appointed to rule Rascia as a vassal, and when Bodin was captured by the Byzantines, Vukan...

 (Rascia, the most powerful Serb principality) under the rule of the Vukanović dynasty. He was buried an the Church of Saint George in Bar.