Why do you suppose that there is little information about intelligence gathering in ancient Rome compared to today's intelligence methods?
O Military intelligence is a recent practice
The information from antiquity is probably contained in Latin and Greek languages
O Only scholars know about ancient spying
O Codes and ciphers were invented only recently

personally I'd say the information from antiquity is probably contained in Latin and Greek languages.

Explanation:

I say this is the answer because most people don't know how to translate Latin and Greek languages. so naturally most people would look at it and go "I have no idea what I'm looking at" and move on. so I think that it would be lack of knowing about Latin Greek languages

d definitly is not

what does your friend need with?