In AD 43, various islands (including Britain, Ireland, and Thule) were referred to as Septemtrionalis Oceani Insulae ("islands of the Northern Ocean") by Pomponius Mela, one of the earliest Roman geographers.
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The Romans knew it as Portus Magnus Artaborum and amongst other historical references it's worth mentioning Pomponius Mela, a Roman historian who wrote in the year AD 43.
The classical authors Pomponius Mela and Pliny the Elder wrote about the Celtic and non-Celtic populations of Gallaecia and Lusitania but several modern scholars have postulated Lusitanian and Gallaecian as a single archaic Celtic language.
Hecateus of Abdera writes that the Oceanus of the Hyperboreans is neither the Arctic Ocean nor Western Ocean, but the sea located to the north of the ancient Greek world, called "the most admirable of all seas" by Herodotus (lib. IV 85), called the "immense sea" by Pomponius Mela (lib. I. c. 19) and by Dionysius Periegetes (Orbis Descriptio, v. 165), and which is named Mare majus on medieval geographic maps.