Britanniam
Britanniam is a Latin form of Britannia, meaning “Britain”. It is the accusative singular feminine noun.
Found 56 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 2.14.4: Qui eius consilii principes fuissent, quod intellegerent quantam calamitatem civitati intulissent, in Britanniam profugisse.
All forms of Britannia (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.