Allobrogum
Allobrogum is a Latin form of Allobroges, meaning “the Allobroges; a warlike people in Gallia Narbonensis”. It is the genitive plural masculine noun.
Found 34 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 1.6.2: alterum per provinciam nostram, multo facilius atque expeditius, propterea quod inter fines Helvetiorum et Allobrogum, qui nuper pacati erant, Rhodanus fluit isque non nullis locis vado transitur.
All forms of Allobroges (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.