Dictionary of Greek and Roman Geography/Cossini
COSSINl (Κόσσινοι). According to a fragment of Artemidorus, cited by Stephanus (s. v. Ὠστίωνες), the Ostiones were a people on the Western Ocean, who were also called Cossini by Artemidorus, but Ostiaei by Pytheas. It seems probable, that the Ostiones or Ostiaei are the Osismii of Caesar. (B. G. ii. 34.) Walckenaer, who is ingenious on such obscure names, docs not admit that these Cossini are the same as the Ostiaei, but he assumes them to be a neighbouring tribes at the western extremity of Bretagne. Then is a place Coesnou or Coueznou near Brest. [ G. L. ]