Ballista & Onager

Advanced ancient artillery including Greek ballistae and later Roman onagers, using engineered frames and stored mechanical energy to hurl large bolts or stones.

Core metadata

ID: ballista_onager
Era: Classical
First known date: -399 (exact)
Region: Syracuse and wider Greek/Roman Mediterranean
Review status: source_checked
Maturity: N/A

Prerequisites

Dependents

None.

Fields

None.

Node sources

Ancient Catapults: Some Hypotheses Reexamined (Hesperia / American School of Classical Studies at Athens, 2011, review) • Supports: node
Locator: The article discusses Diodorus' account that catapult development began under Dionysios I at Syracuse in 399 BCE and that the weapon appeared at the siege of Motya in 397 BCE.
Catapult (Encyclopaedia Britannica, 2026, textbook) • Supports: node
Locator: Britannica describes ancient catapults using tension or torsion in twisted cords of horsehair, gut, sinew, or other fibres.

Prerequisite edge evidence

Edge/source evidence summary:

Prerequisite edges: 4
Average edge confidence: 70%
Prerequisite sources: 1
expert_inference: 4

Prerequisite	Type	Confidence	Evidence level	Note	Sources
Siege Engineering (siege_engineering)	enabling	68%	expert_inference	Siege Engineering provides a capability that enables this technology without being the only possible path.	No sources recorded.
Torsion Springs (torsion_springs)	enabling	68%	expert_inference	Torsion Springs provides a capability that enables this technology without being the only possible path.	No sources recorded.
Geometry (geometry)	enabling	68%	expert_inference	Geometry provides a capability that enables this technology without being the only possible path.	Geometry (Encyclopaedia Britannica, 2026, textbook) • Supports: edge
Early Ballistics (ballistics_early)	historical_predecessor	75%	expert_inference	Early Ballistics is an earlier historical predecessor or foundation, not a one-to-one engineering dependency.	No sources recorded.

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