Bylazora or Vilazora is a Paeonian city that was located on the Axius River at Veles in the Republic of Macedonia. Polybius tells us that "King Philip V captured Bylazora, the largest town of Paeonia, and very favourably situated for commanding the pass from Dardania to Macedonia: so that by this achievement he was all but entirely freed from any fear of the Dardani, it being no longer easy for them to invade Macedonia, as long as this city gave Philip the command of the pass". In 219 BC, the Dardanians collected their forces for a raid into Macedonia and at that time must Bylazora already have been in their hands.
Bylazora with its location at Veles commanded the entrance to a long defile and, no less important, a route southwestwards into Pelagonia via the Babuna Valley, or Raec Valley into Styberra and interior of the Macedonian Kingdom. One assumes that Bylazora as the largest Paeonian town must have been in Dardanian possession when Philip V captured it in 217 BC, and then garrisoning it with aim to end Dardanian raid. Bylazora is also mentioned by Livy in his "The History of Rome" when Perseus in 168 BC arranged military support from the Gauls

Gauls

The Gauls were a Celtic people living in Gaul, the region roughly corresponding to what is now France, Belgium, Switzerland and Northern Italy, from the Iron Age through the Roman period. They mostly spoke the Continental Celtic language called Gaulish....

who were camping in Desudaba, Maedica, requesting the Gaulish army to shift their camp to Bylazora, a place in Paeonia, and their officers to go in a body to him at Almana on the River Axius.