Based on the archaeological findings, the history of the Triballi can be divided in four periods: Proto-Triballian (1300-800 BC), Early Triballian (800-600 BC), Triballian (600-335 BC) and period from 335 BC until Roman conquest.
In 424 BC, they were attacked by Sitalkes, king of the Odrysae, who was defeated and lost his life in the engagement. They were pushed to the east by the invading Autariatae, an Illyrian tribe; the date of this event is uncertain.
In 376 BC, a large band of Triballi under King Hales crossed Mount Haemus and advanced as far as Abdera; they had backing from Maroneia and were preparing to besiege the city when Chabrias appeared off the coast, with the Athenian fleet, and organized a reconciliation.
In 339 BC, when Philip II of Macedon was returning from his expedition against the Scythians, the Triballi refused to allow him to pass the Haemus unless they received a share of the booty. Hostilities took place, in which Philip was defeated and wounded by a spear in his right thigh, but the Triballi appear to have been subsequently subdued by him.
After the death of Philip, Alexander the Great passed through the lands of the Odrysians in 335-334 BC, crossed the Haemus ranges and after three encounters (Battle of Haemus, Battle at Lyginus river, Battle at Peuce Island) defeated and drove the Triballians to the junction of the Lyginus at the Danube. 3,000 Triballi were killed, the rest fled. Their king Syrmus (eponymous to RomanSirmium) took refuge on the Danubian island of Peukê, where most of the remnants of the defeated Thracians were exiled. The successful Macedonian attacks terrorized the tribes around the Danube; the autonomous Thracian tribes sent tributes for peace, Alexander was satisfied with his operations and accepted peace because of his greater wars in Asia.
They were attacked by Autariatae and Celts in 295 BC.
The punishment inflicted by Ptolemy Keraunos on the Getae, however, induced the Triballi to sue for peace. About 279 BC, a host of Gauls (Scordisci) under Cerethrius defeated the Triballi with an army of 3,000 horsemen and 15,000 foot soldiers. The defeat pushed the Triballi further to the east. Nevertheless, they continued to cause trouble to the Roman governors of Macedonia for fifty years (135 BC-84 BC).
The Illyrian Dardani tribe settled in the southwest of the Triballi area in 87 BC. The Thracian place names survives the Romanization of the region.
In the time of Ptolemy (90-168 AD), their territory was limited to the district between the Ciabrus (Tzibritza) and Utus (Vit) rivers, part of what is now Bulgaria; their chief town was Oescus.
Under Tiberius, mention is made of Triballia in Moesia; and the Emperor Maximinus Thrax (reigned 235-237) had been a commander of a squadron of Triballi. The name occurs for the last time during the reign of Diocletian, who dates a letter from Triballis.
Exonym of Serbs
The Seal of the Serbian Parliament, 1805
Golden pitcher from Vratsa
The term "Triballians" appears frequently in Byzantine and other European works of the Middle Ages, referring exclusively to Serbs. Some of these authors clearly explain that "Triballian" is synonym to "Serbian". For example, Niketas Choniates (or Acominatus, 1155-1215 or-16) in his history about Emperor Ioannes Komnenos: "... Shortly after this, he campaigned against the nation of Triballians (whom someone may call Serbians as well) ..." or the much later Demetrios Chalkondyles (1423-1511), referring to an Islamized Christian noble: "... This Mahmud, son of Michael, is Triballian, which means Serbian, by his mother, and Greek by his father." or Mehmed the Conqueror when referring to the plundering of Serbia.
The written sources on the Triballi are scarce but the archaeological remains are abundant. The scientific research of the Triballi was boosted with Fanula Papazoglu's book The Central Balkan Tribes in Pre-Roman Times (1968 in Serbia, 1978 in English). Other historians and archaeologists who wrote on the Triballi include Milutin Gara?anin, Dragoslav Srejovi?, Nikola Tasi?, Rastko Vasi?, Milo? Jevti? and, especially, Milorad Stoji? (Tribali u arheologiji i istorijskim izvorima, 2017). Even though the two names were used as synonyms by some Byzantine sources and certain heraldic inheritance, Serbian official historiography is not equalizing the Serbs and the Triballi, nor does it fabricate a cultural continuity between the two.
A male grave at Vratsa, with a female thracian suttee. Dated to the 4th century BC, the royal tomb contains beautiful goldwork, like pitchers and wreaths.
^ abGeorge Grote: History of Greece: I. Legendary Greece. II. Grecian history to the reign of Peisistratus at Athens, Vol 12, 1856 "...from the plain of Kossovo in modern Servia northward towards the Danube..."
^Alexander the Great at War: His army - His battles - His Enemies (General Military) by Ruth Sheppard, 2008, page 69, "... for savagery and their contact with the Scythians, Illyrians and Celts left influences upon the Triballi, and these influences may be ..."
^The Thracians 700 BC-AD 46 (Men-at-Arms) by Christopher Webber and Angus McBride, 2001, ISBN1-84176-329-2, page 6
^ abcSofija Petkovi?, Milorad Stoji? (20 January 2018). "Tribali - najstariji stanovnici Srbije" [Triballi - the oldest inhabitants of Serbia]. Politika-Kulturni dodatak (in Serbian). pp. 06-07.
^Potter, G. R. (1938). "JSTOR: The English Historical Review, Vol. 53, No. 209 (Jan., 1938), pp. 129-131". The English Historical Review. jstor.org. 53 (209): 129-131. doi:10.1093/ehr/LIII.CCIX.129. JSTOR554790.