The Greco-Roman historian Diodorus Siculus attributed them a name of another Celtic tribe: "Those who are called Lusitanians are the bravest of all Cimbri", often thought of as Germanic. The Lusitanians were also called Belitanians, according to the diviner Artemidorus. Strabo differentiated the Lusitanians from the Iberian tribes and called them Celts who had been known as Oestriminis in ancient times. Pliny the Elder and Pomponius Mela distinguished the Lusitanians from neighboring Celtic groups like the Artabrians in their geographical writings.