who were The four enemies that the ancient Romans battled against?

The Romans were aformidable force, their army the ultimate fighting force. naturally, having conquered most of the known world they made a lot of enemies. But to sum it all up here is a list of all of their enemies regardless of whether they were beaten or not:

Germans and all barbarians

Carthaginians

Celts

Egyptians

Nubians

Trevernii

Avernii

Greeks

Ubians

Iceni

Ostrogoths

Visgoths

Goths

Huns

Persians

Pics

Israelis

Belgics

and probably a lot more but those are the ones I know about.
the Greeks