Monumenta Vetera

[Flavivs Aetivs]

I know in it are mentioned (in the section on those living on the Don/Volga) "and many other unnamed peoples" to the east.

Maenchen Helfen uses it as he thinks Ammianus was referring to it in part of his description of the Alans.

Relavant passage from Ammianus:

Well then, at the very beginning of this district, where the Riphaean mountains sink to the plain, dwell the Aremphaei, just men and known for their gentleness, through whose country flow the rivers Chronius and Visula. Near them are the Massagetae, Halani, and Sargetae, as well as several other obscure peoples whose names and customs are unknown to us. 39 Then at a considerable distance the Carcinitian gulf opens up, with a river of the same name, and the grove of Trivia,sacred in those regions. 40 Next the Borysthenes, rising in the mountains of the Nervii, rich in waters from its own springs, which are increased by many tributaries, and mingle with the sea in high-rolling waves. On its well-wooded banks are the cities of Borysthenes and Cephalonesus and the altars consecrated to Alexander the Great and Augustus Caesar. 41 Then, a long distance away, is a peninsula inhabited by the Sindi, people of low birth, who after the disaster to their masters in Asia got possession of their wives and property. Next to these is a narrow strip of shore which the natives call Ἀχιλλέως δρόμος,memorable in times past for the exercises of the Thessalian leader. And next to it is the city Tyros, a colony of the Phoenicians, washed by the river Tyras.

Note: Ammainus seems to associate the Riphean Mountains with the uppermost Carpathians.

EDIT: I'm interested in this particular part of the passage (which is a reference to the 5th century BC Sindi)

Then, a long distance away, is a peninsula inhabited by the Sindi, people of low birth, who after the disaster to their masters in Asia121 got possession of their wives and property.

Is this part of the history of the original "Sindi" that he quoted or an addition he made up?