Kammala jumla mai zuwa: Tricastini wataƙila ɗaya ne daga cikin tsoffin ƙabilun Celtic na Gaul. An fara ambaton su a cikin labarin almara na Livy game da tafiyar Bellovesus daga Gaul zuwa Italiya, sannan a cikin tarihinsa na
Hannibal ya haye Alps a cikin 218 BC, lokacin da Tricastini ya bar sojojin Carthaginian su matsa ta ƙasarsu. Bayan shekara ta 121 kafin haihuwar Yesu, Jamhuriyar Roma ta haɗu da yankunansu zuwa lardin Gallia Transalpina. A ƙarni na 1 AD, Tricastini sun kasance ɓangare na ƙungiyar Cavarian.