Roman gods and goddesses were named after objects and did not possess a gender, whereas Greek gods were decided by human characteristics and traits. As Greek gods predated Roman gods, Roman mythology would take the Greek deity and assign a Roman object that would fit the description of the Greek god.
Right now, I would call them "diaspora" if they're more dispersed (Armenian diaspora is quite well-known) or a "community", for example "French community" if they're more closely in contact.
If they reject their new land's law and intend to include this land into their old one, they could be "colonizers".
