Galliis
Galliis is a Latin form of Gallia, meaning “Gaul”. It is the ablative plural feminine noun or dative plural feminine noun.
It can also be a form of Gallius, “Gallius (Roman name); (Galliae) the Gallic provinces”.
Found 31 times in the Latin texts on Socratos.
Where it is used
Cicero, Philippicae 1.8: … rem conventuram: Kalendis senatum frequentem fore; Antonium, repudiatis malis suasoribus, remissis provinciis Galliis, ad auctoritatem senatus esse rediturum.
All forms of Gallia (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.