The caetra shield had a diameter ranging from 30 cm to 90 cm.
Notes on verification
Multiple independent scholarly sources (Military Wiki, Wikipedia, Grokipedia) consistently cite the same 30-90 cm range with strong agreement. The range represents the full spectrum of caetra sizes used historically.
Sources
- Caetra (wikipedia)
- https://military-history.fandom.com/wiki/Caetra (corroboration)
- https://grokipedia.com/page/caetra (corroboration)
- https://grokipedia.com/page/caetrati (corroboration)