The chief difficulty in deciding their ethnical relations is their remarkable physical difference from the neighbouring peoples.
Hunter states that the Dravidian tribes were driven southwards in Hindustan, and that the grammatical relations of their dialects are " expressed by suffixes," which is true as to the Australian languages.
The Romans knew as little about Istakhr as the Greeks had done about Persepolis - and this in spite of the fact that for four hundred years the Sassanians maintained relations, friendly or hostile, with the empire.
The story of William's relations with King John is interesting, although the details are somewhat obscure.
The history of Aegina, as it has come down to us, is almost exclusively a history of its relations with the neighbouring state of Athens.