The governor of Egypt was the only Equestrian permitted to command legions

Evidence

The governor of Egypt (praefectus Aegypti) was an Equestrian, and he was in the unique position of being the only Equestrian to command legions. — Stephen Kershaw, A Brief History of the Roman Empire, 311

Categorization

• corroborated: 2 independent passages support this claim — Stephen Kershaw, A Brief History of the Roman Empire, 311