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Marcus Julius Cottius was king of the Ligurian tribes inhabiting the mountainous region now known as the Cottian Alps early in the 1st century BC He was the son and successor of King Donnus, who had previously opposed but later made peace with Julius Caesar.
Pointe Sommeiller, a 3332-meter-high peak in the Cottian Alps, and Col Sommeiller, the nearby mountain pass linking Bramans, France to Bardonecchia, Italy, were named in his honour.
The stream is formed from Lago Verde, a small Alpine lake in the Cottian Alps, and initially runs northwards, before reaching the comune of Salza di Pinerolo and turning east.
The stream is formed at the western slope of Monte Granero in the Cottian Alps and initially runs northwards, before turning east and reaching the comune of Bobbio Pellice.