Histri

[9] Since they inhabited the Istrian peninsula, they had more intensive trade and cultural contacts with the Mediterranean world, particularly central and southern Italy.

[3] The Romans described the Histri as a fierce tribe of pirates, protected by the difficult navigation of their rocky coasts.

An account stated that this tribe was first in the northern Adriatic area to be threatened by the Roman imperialism and to start a war.

[10] In the Augustan age the most of Istria was then called, together with the Venetian part, the X Roman region of Venetia et Histria: the ancient definition of the northeastern border of Italy.

Dante Alighieri refers to it as well; the eastern border of Italy per ancient definition is the river Arsia.