Osismii - Authority in Tribe from to
The Osismii were a Gaulish tribe on the western Armorican peninsula. They were first described as the Ostimioi by the Greek geographer and traveller Pytheas in the fourth century BC.

Their name (Ostimioi) means "the farthest" or "those at the end of the world". Their territory corresponded broadly to the modern French département of Finistère, whose name reflects the same meaning in Latin Finis Terræ, i.e. end of the earth.

They submitted to Caesar during the Gallic Wars, in 57 BC. The next year, they revolted along with the Veneti, but were put down. They became a Roman civitas and their identity survived into Late Antiquity.
Osismii
Osismii of Tribe