The Cadusii in history and in fiction

Lands and peoples on the northern edge of an empire never fail to arouse curiosity; and their first entry into history exhibits sharp contrasts. The Hyrcani made a notable impact when Alexander in the year 330 invaded their country. Hyrcania permits a fairly close definition. It occupied the southeastern corner of the Caspian (a sea which frequently took that name). To the north was the wide steppe, inhabited by the Dahae, on the east the region Margiana. To the south Hyrcania extended into the Elburz mountains; and under the last Achaemenid it formed one satrapy with Parthyene, its neighbour on the southeast. Belonging to the narrow neck between the Caspian and the Salt Desert, Hyrcania lay beside the highroad from Ecbatana to Bactra. Hence a vital link for successive imperial powers.