
1) Ancient tribe in Bulgaria 2) Thracian tribe
Found on
https://www.crosswordclues.com/clue/triballi

The Triballi (Τριβαλλοί) were an ancient tribe whose dominion was around the plains of modern southern Serbia and western Bulgaria, at the Angrus and Brongus (the South and West Morava) and the Iskar River, roughly centered where Serbia and Bulgaria are joined. The Triballi were a Thracian tribe that received influences from Celts, Scythi...
Found on
http://en.wikipedia.org/wiki/Triballi

a Thracian people whose earliest known home was the `Triballian plain` (probably the Plain of Kosovo), near the junction of the Angrus and Brongus ...
Found on
http://www.britannica.com/eb/a-z/t/78
No exact match found.