Osismii
The Osismii, Ossismii, or Ostimii (also Ossismi, Osismi) were a Gallic tribe dwelling in the western part of the Armorican Peninsula (modern Brittany) during the Iron Age and the Roman period. Etymology. They are mentioned as "Osismos" and "Osismi" ( "ossismi") by Caesar (mid-1st c. BC), "O̓sísmioi" (Ὀσίσμιοι) by Strabo (early 1st c. AD), "Ossismos" by Pliny (1st c. AD), "O̓sismíous" (Ὀσισμίους; Ὀσίσμιοι, Ὀσισμαίους) by Ptolemy (2nd c. AD), and as "Osismis" in the "Notitia Dignitatum" (5th c. AD). According to Strabo, the Massaliote explorer Pytheas, who travelled to northwestern Europe in the late 4th century BC, reported the variant  Ōstimíous (Ὠστιμίους), which seems to be the earliest form of the name, documented before the well-known Gaulish sound shift -"st"- > -"ss"- occurred. The Gaulish ethnonym "Ostim(i)i" ( "Ostim(i)os") literally means 'the ultimate', that is to say 'the remotest people', 'those who dwell at the extremity of the Armorican Peninsula'. It stems from the Celtic root "ostim"- ('ultimate, extreme'), itself from an earlier *"postim"- ('last'; cf. Lat. "postumus" 'last-born, final'). In Middle French, the territory they occupied was known as ("Fine) Posterne". Geography. The territory of the Osismii was located at the extremity of the Brittany Peninsula, west of  the Veneti and Coriosolites. Pytheas situated the Osismii at the end of the peninsula of "Kabaïon", which is not clearly identifiable today. This could be related to large peninsula of "Cap-Sizun", on the southern-western coast of Finistère, just before reaching the difficult maritime pass of "Pointe du Raz" where the waters of the Atlantic Ocean and of the English channel are joining; this peninsula offers to the south a natural safe harbour in the aber and bay of today's town of Audierne, as well as in the bay of today's Douarnenez, to the north of the  peninsula. Other hypotheses situate it in the small peninsula of "Kermorvan" in today's commune of Ploumoguer and bordering the ria of Le Conquet, but the whole peninsula of Crozon with its large bays and safe harbors is not excluded, even if it does not extend to the westernmost point. Their chief town was Vorgium (present-day Carhaix). History. They submitted to Caesar during the Gallic Wars, in 58 BC, but took part in an insurrection against Rome in 56 BC.