They are mentioned as
Orobii by
Cato the Elder (early 2nd century BC). The ethnic name
Orobii appears to be of Celtic origin. It can be compared with the
Gaulish noun
orbioi (sing.
orbios), meaning 'the heirs', with the feminine forms
Orobia and
Urbia (earlier *
Orbia), the ancient names of the
Orge river and , and with the i-stem
Orobis, now the
Orb river. Some classical writers such as
Pliny the Elder thought that their name was of Greek origin, tracing the etymology from the Greek
Orōn bion (Ορων βιον). == Geography ==