In the history of European, Asian, Nordic etc. Clashes was it common to have an interpreters or even have bilingual speakers in those times?

by GoodLeftUndone

I'm looking more towards dark ages, Viking expeditions, roman conquests, Persian armies, etc.

gingerkid1234

The rules don't allow "throughout history" questions. However, questions about communication between different groups is in our FAQ, so you may find your answer there.