Publius Flavius Vegetius Renatus (4th century, possibly into the 5th), commonly referred to simply as Vegetius, was a writer of the Later Roman Empire.
- Igitur qui desiderat pacem, praeparet bellum.
- Therefore, whoever wishes for peace, let him prepare for war.
- De Re Militari (also known as Epitoma rei militaris), Book 3
- Variant: Si vis pacem para bellum. ("If you want peace, prepare for war.")