Ballistarius (plural ballistarii) were infantrymen, serving as artillerymen of the Roman army who handled ballistae.1 They were classed as immunes, exempt from fatigue duty of entrenching or building.1
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Notes
- Zăgreanu, Radu (2013). "Proiectile de piatră din castrul roman de la Arcobadara". Revista Bistriței. Editura Accent. p. 9. Retrieved April 10, 2014.